When you are ready to start building your meal you can find your meals outlined throughout your day under your schedule. Select the meal you would like to edit and from there you will be greeted with an empty meal window. To add foods, you can select the bar code scanner of the search box at the bottom of your screen.
Simply select the option you want and add the foods you plan on having to your meal! When using the search function you can navigate through all foods, RP verified, restaurant options, and more.
Once you have your foods selected and ready to go you can check in your meal to complete it and log your meal. Don't stress being slightly over or under in single meals. You can see in your Day Status where you are and slight deviations are totally fine. If you are +/- 10 grams here and there, it is no big deal! You can monitor your Day Status to see where you stand for the day. if by the end of the day it shows that you are on track at the bottom you are good to go!
You can find the check-in option by sliding right on the meal and hitting check-in. In doing so, you will find the Macros registered at the top along side your totals for the day.