Under Settings->Taps, if you scroll to right, you can enter or modify your tap cleaning schedule. If you use an additional cleaner besides standard Alkaline and Acid, you can enter the name at the top of the page, and enter its schedule in the Additional Cleaner column. The values are in days.

Once this is done, on the Management Page there is a Tap Maintenance button. When your lines are cleaned you can record this on the History Tab. Going to the Status tab will show if any lines are overdue for cleaning. Taps 2 weeks or less overdue are shown in Yellow, over two weeks are Red. Also, when change a keg, you will see a notice if the line is overdue for cleaning.