Weight loss starts at a calorie deficit. Typically your calorie needs minus 500cals consistently helps as a starting point

First thing you need to know is where you're at right now in terms of CICO and macros. I presume if your here that you're using the app to track your food so you should know your calories in. Weight yourself every day and take a 2 week average of your weight to see what happens for that calorie intake. That will give you an indication of your energy balance. As a general rule of thumb, multiply your bodyweight in lbs by 10 to get your weight loss calories. Once you know that, the macro split should be around 0.8-1.2g per lb of bodyweight of Protein (always start with Protein), 25-35% of total calorie intake in Fats and the rest in Carbs. Remember that 1g of Protein = 4 calories, 1g of Fat = 9 calories, 1g of Carbs = 4 calories and 1g of alcohol =7 calories. First things first though, work out where you are now before you start to adjust. Hope that helps.

A little late to reply but I found this tool to be very helpful. It's an online calculator and is completely customizable. It also has a lot of future projections, etc. If you like hard data to build around I found this to be extremely helpful. It says Keto Calculator, but as I said, you can customize your macros.

https://keto-calculator.ankerl.com/