On generic supporter pages, it is not possible for supporters to add offline donations to their pages, however if you subscribe to everydayhero Pro, you (the charity) have control over whether you allow supporters of your campaigns the ability to add offline donations if you wish to turn this on. When offline donations are added to a supporter page, you will see these reported separately to online donations on the Donations report and Transaction details reports.

How to sign up for everydayhero Pro