When you log in Edit User , you will see Search User panel, don't be confused, in fact this is the most efficient way to locate a user when your have tens of thousands of records in database.
Let's explain the feature in this way, if we need to modify the information of a user named Tom, we can do it in this way: we fill in the textbox with "Tom", and click Search.
If we need to modify Tom's user information, we can click his name directly, or click Edit button.
Here you can modify his user information like password, Email, Location, credits amount and membership, etc. when you're done, click Submit.
If you need to delete the user, you may click Delete in Edit User panel.