With user impersonations you can easily impersonate any user on your site. This will come in handy when you need to debug an issue that a specific user is experiencing.
Impersonating a user will allow you to login to your application acting as a specific user.
To impersonate a user you can visit your users section in your admin application at. on the right click more button to impersonate any user.
You will now have this screen, when done. You can Stop Impersonate the user.