I just opened a Roth IRA account on Fidelity and put $7000 in it. Now what?

UPDATE: Thank you everyone! I'll be using as much of your advice as possible!

I know I know, many people have posted this question but I'm a bit confused on the app. Does it want me "buy" the investment pool or do I set it and forget it?

Apologies for this question, please ELI5 as I'm struggling with reading the things in this subreddit. My family was never very good at investments and retirement funds so I'm really trying to learn.

Thank you!