SkyForum is 100% correct, But for clarity's sake, I'll see if I can explain in more detail.
If you are looking for an admin function to create a member, there isn't one.
The only way to add a new profile, is to log out, and register as the new profile.
I'm curious however, why you wish to add new profiles yourself?
If it's for testing purposes, this is perfectly understandable, My dolphin site has a test user which I give user level of access to so that I may view my site from a member's perspective at any time (simultaneously logged in using another browser, Chrome & Firefox)
If however, you are doing this to create Bogus profiles, that inflate your sites membership artificially...Be very VERY careful. 1. It's unethical, 2. it's kinda easy to spot. 3. If you are using real people's images, make sure you have permission, or you run the risk of getting caught (maybe not a huge risk of getting caught, but huge penalties if you do). 4. It's just wrong.
Hope that helps.