how do you change your food to low carb

If you mean you want to edit your nutritional goals, click on My Home at the top, then click on Goals, then click Edit next to Daily Nutrition Goals or Micronutrients. If you mean you need to know what values to assign to these things, talk to your doctor or nutritionist.

Swap breads, pastas, rice, etc. with non starchy produce, more protein, and fats?

This macros calculator makes setting up your macros easy. http://keto-calculator.ankerl.com/ A ketogenic or very low carb diet is usually 5% or 10% carbs, no more than 50g. This is where many of us with diabetes or prediabetes start. You could go as high as 100 or 150g, but the benefit of improved insulin resistance may not be there at that ratio.

Protein is usually somewhere between 15 and 25% with some more active people going higher. Fat typically fills in the rest at 80-50%. 60-75% seems the most common for those treating diabetes with low carb diets.

For more advice on low carb, try the Low Carber Daily Forum. http://community.myfitnesspal.com/en/group/394-low-carber-daily-forum-the-lcd-group

Also try reading Dr Bernstein's Diabetes Solution. Great book with a really good low carb plan. http://www.diabetes-book.com/

Dr Jason Fung has plenty of videos on a low carb diet, and discusses intermittent fasting which is proving to be beneficial in reversing insulin resistance. This is a good one to start with: https://www.youtube.com/watch?v=YpllomiDMX0
He also has a new book out called The Obesity Code.

Otherwise, like some of the above posts said:

• drop sugar and sugar added foods (meaning anthing that ends in "ose", high fructose corn syrup, honey, syrups, most sugar alcohols - ending in "tol" and foods ending in "dextrin"),
• avoid grains (corn, rice, quinoa) and foods made from grains (with wheat flour, buckwheat flour, etc),
• limit starchy root vegetables like potatoes and turnips,
• limit high GI frits like grapes, mangos, banana and other tropical fruits

Some diabetics are able to reverse their diabetes without cutting carbs, especially if they lose weight and exercise daily. I do not know of any diabetic that went low carb that did not start to reverse their daibetes though, even without weight loss.

Eat plenty of meats, eggs, olives, nuts, avocados, full fat dairy (cheese, heavy cream, butter, coconut (oil, cream, flakes), and a variety of vegetables, and some berries.

Clean out your pantry, and fill you freezer with colorful vegetables,boneless skinless chicken tenders or breasts, fish filets (tilapia and swai are relatively low calorie, and inexpensive), get some eggs and stock up on spices. Blood sugar should drop, and your weight as well.