If your institution has Guest Accounts enabled, you'll see "Guest Accounts" as an option in the drop down menu on the upper-left of the page. This page allows institutional admins to quickly view and edit all Guest Accounts, and to create new ones.
Sorted by Last Name, the Guest Account page shows name, email, and registration status for all of an institution's guest accounts.
Clicking "Edit Guest Account" will open a properties pane. This pane allows institutional administrators to edit name and email fields for a guest account, or to remove the account by clicking "Remove Guest Account".