From FastDraw Web - https://fastscout.fastmodelsports.com/plays/ - find the play you'd like to see via the mobile app and select the mobile icon on the left. You can also use the checkboxes to select multiple plays at once.
If you have checked the plays you want to add/remove, right-click and select Edit Mobile Access (x) where the number of plays selected will be noted.
Whether you're enabling/disabling mobile access for 1 play or multiple, you'll see a list of all users in your account. For most accounts, you will only have coaches and players. You can select the check next to the header to quickly check/uncheck all users under that category. Once done, select Save in the bottom right corner.