To add a back-up approver to your profile;
- Log in to the online booking tool, and on the right hand side will be a welcome and your name, this is your profile.
- Click on your profile and a box will appear (My Profile).
- Under 'Personal Details', at the bottom, you can select (or add, depending on your permissions) a back-up approver.
- And don't forget to save your changes.
Here's a screenshot to help.