Frustrated!!!

Can't give advice other than be patient, especially since your diary isn't open for us to peek at and see what you are eating and doing for exercise.

After a quick glance at your diary.... please eat less processed foods. And less artificial sweeteners. Artifical sweeteners have been linked to weight gain, causing people to crave sugar and eat more than they would have with plain sugar.

Try to eat more fresh veggies and fruits, and whole grains.

It looks like you aren't drinking any water, so be sure you're drinking plenty of water. It's important to log water too to make sure that you're adequately hydrated.

You should also monitor your sodium content. I see that you aren't monitoring this in your diary, and you're eating foods that are somewhat processed and have a high sodium content.

Have you added any exercise into your health plan? Even getting out for a short walk is a start.

Also, take measurements so even if the scale doesn't move you may see progress in your measurements!

Buy, they are not expensive AT ALL, a good digital scale, measure your food. Eat less processed food, you'll get to eat more, have an apple and some peanut butter, some good toast with avocado...A smoothie. Maybe try eating your exercise calories, or at least half of them. Drink a TON of water. Eat healthy fats. Maybe buy a heart rate monitor and see just how many calories you are burning. Ditch the scale for a bit and measure yourself every week instead.

You say you're a horse trainer? That's a fairly active lifestyle.
I hope you don't mind, but I took a peek at your diary and saw that your daily calorie goal is only 1,200.
I'm no expert, but that's rather low. 1,200 is the bare minimum that you ought to be consuming.
I have a sedentary lifestyle and mine is 1,400/day.

Yes I measure my foods.

What processed foods are you all referring to except for the one microwave meal (lean cuisine ect) I have at lunch I am not sure what else is processed.

Well if I look at your diary for the last two days, really the only UNprocessed foods are the yoghurt and sweet potato. I'm not going to get on the 'only eat clean' bandwagon here, don't care for that much... but I think a balance is important and that if you have a good portion of your diet made up of meats, fruit & veg, nuts, dairy etc it is better than getting most of your calories from processed stuff like snack bars, microwave meals, pre-prepared soups etc. It will also significantly lower your sodium intake.

Check your settings and make sure you are not set to sedentary, you should probably be set to lightly active with the calories you have said you burn through the day. How much weight you aim to lose each wee will depend on your current weight / bf%, but 1 to 1 1/2% should be fine if you have more than 20lbs left to lose.

These are just a few suggestions. Some may work for you, some may not.

Firstly, I agree with what previous posters have said – try to eat a little "cleaner." It's always a good idea to include a little more raw fruits and vegetables. Apples, bananas, oranges, grapefruit, pear, frozen berries, carrots, celery, lettuce, spinach, tomatoes, yams, onions, peas, peppers, asparagus, broccoli... The list goes on.

A few other foods you might consider including, in place of some of your current meals: oats, brown rice, Greek yogurt, fish (I'm a salmon lover, but I've heard tilapia is good), chicken, raw nuts (almonds, walnuts), seeds, edamame (soybeans), and seaweed (it's an acquired taste, but it's actually quite good for you).

You eat boxed dinners frequently. If you have the space and time to cook, then by all means, learn how! You can look up healthy recipes online, most ingredients aren't hard to find, and I think you'll find cooking surprisingly easy and enjoyable. A home-cooked meal will certainly be better for you than a packaged one. It will also make you more mindful of what you're eating.

Another thing... I would start tracking your sodium. MFP's estimate is ridiculously high. You should consume no more than 2,300 mg of sodium per day, and research has actually shown that 1,500 mg per day is a healthier amount.
(For reference: http://www.cdc.gov/features/sodium/)

Also, your carbs seem awfully high. I don't like "low-carb" diets (I'm more of an everything-in-moderation kind of girl), but you're regularly getting over 200 grams per day, which seems a bit much for a 1200-1500 calorie diet. You can adjust your macro goals under "settings." Personally, I prefer to stay in between 100 and 200 grams per day, but play around a bit and find an amount that works for you.

Don't forget to drink plenty of water! Don't force yourself to drink if you honestly aren't thirsty, but make sure to include a full glass of water with each meal, and at least a couple more throughout the day.

If you're just starting to exercise more, you may retain water for a few days (or even weeks) while your body adjusts. This is normal.

Finally, you could just try waiting. Sometimes, it takes a long time to see "progress." Measure inches and body fat, not pounds, and focus on how you feel rather than what the scale says. If you feel energetic and healthy, and if your stamina is increasing while your body fat is decreasing... then clearly, you're doing something right!