Both. Here are the steps:
In the TurboTax Online program,
- After sign in to your account, follow prompts
- To your left, select Federal
- On the next screen, from the top, select Other Tax Situations and Done with Others (at the bottom)
- On the screen, Let's make sure you got the right stimulus amount, select Continue
- Select "Yes", enter the amount you have received for both stimulus payments and follow prompts
- See image below.