Confluence 5.7 has reached end of life
Check out the [latest version] of the documentation
Choose your profile picture at top right of the screen, then choose Profile
Or, choose the Profile link in the sidebar of your personal space.
To find someone else's user profile:
Move your mouse pointer over a user's linked name or profile picture
Choose the user's linked name to open their user profile
Alternatively, you can choose the Profile link in the sidebar of the user's personal space or go directly to this URL:
http://MY.CONFLUENCE.COM/users/viewuserprofile.action?username=USERNAME
Note: If a Confluence Administrator has granted the 'View User Profiles' permission to anonymous users, you can access people's hover profile popups without logging in. However, the hover profile features available to anonymous users are restricted.