I dont know what to title this

You know where it says

Joined: ____________
Posts: ____________

Its under each persons avatar? Well, is there any way to add more categories under that.
(EX: Name: _________; so it would show that under posts or something)

It's called Personalized Profiles.

Go to your Admin Panel >> General >> Configuration >> Profiles, scroll all the way down to the bottom and click on Create A Personalized Profile. Follow the prompts.