In order to claim the RRC you need to do the following:
1- On the main screen select amend/change return.
2- Then on your left-hand side menu (computer) or top left-hand side (mobile device) to get the menu.
3- Click tax tools.
4- Then Tools.
5- Click on topic search.
6- Type stimulus
7- Then the software will automatically take you to that section to include the RRC on your 1040X
