On the Web Protection > Filtering Options > Bypass Users tab you can specify which users are allowed to bypass block pages.
To add an existing group or user:
Click the Folder icon next to Users/Groups Allowed to Bypass Blocking.
The list of existing users and groups appears in the left navigation pane.
Select and drag the user or group to the Users/Groups Allowed to Bypass Blocking box.
The item will now be listed on the Bypass Users tab.
To add a new user:
Click the green Plus icon next to Users/Groups Allowed to Bypass Blocking.
The Add User dialog window appears.
Enter user information into the Add User dialog window.
Your settings will be saved.