To switch (SU) to a different user, go through the following steps:

1. Navigate to Administration > User management > Users
2. Click the SU link for the user you want to switch to:

After you have selected the user, your current user session will be switched to that user, with the same configurations and permissions applied. After you are done, you can switch back by selecting the SU Exit option from the SU menu item from the top navigation bar.