How to restrict users from adding substitute users?

Step 1: Determining the permissions of a user.

• Log in to timesheet with administrative privileges.
• Click on the ‘Administration’ tab on the top menu.
• Select ‘Users’ under ‘Shortcuts’ on the left side pane. The ‘List User’ screen appears.
• Click the ‘Edit’ button next to the user name. The ‘Edit User’ screen appears.
• In the ‘Access’ tab under ‘Permissions’, make a note of the permission the user has been assigned.

Step 2: Editing the user’s permission.

• Click on the ‘Administration’ tab on the top menu
• Select ‘Permissions’ under ‘User/Departments’ from the left pane. The ‘Permissions’ page appears.
• Click the ‘Edit’ button next to the permission intended to edit. The 'Edit Permissions' page appears.
• Click the (+) plus sign next to ‘Settings’ under the ‘System’ tab.
• Uncheck the box for the option 'Substitute user'.
• Click on ‘Save’
• Log in as the user to confirm if the changes have taken effect.