Section Headings
Nickname - auto-generated name used interally by the system. You do not have any control over this name, and it is not visible to your users in their personal profiles.
Name - self-explanatory.
Email - the user's primary e-mail address; also used for their login/account name.
New Password - this field allows an admin to reset a user's password to whatever the admin would like.

Edit Membership Info:
Current Membership Level - shows the user's current membership level; the admin can also set this to another level via the drop-down menu.
User's Membership Status - shows the user's current membership status, active or inactive; the admin can also set this to another level via the drop-down menu.
Membership Exp. Date - shows the expiration date of the user's membership; the admin can also set this to another date via the drop-down menus.
Manual Payment Amount - allows the admin to manually enter a payment received by a channel other than the website's online store.
Manual Payment Type - allows the admin to specify way in which the manual payment was made.

Edit User's Group Affiliation - allows the admin to edit this user's group affiliations.

Edit User's Permissions - allows the admin to edit this user's Admin Privileges.