This is a customizable feature in the DR880, you can use up to 4 pedals for controls, and can customize each of them. Here's how:

1. Press Edit (to go to system settings)
2. Cursor Right to Footswitch
3. Press Enter
4. Choose the footswich which you want to customize
5. Change the value
6. Press Exit to save the setting

In step 5, choose the function you wish, here's a tip for the two common uses:

The setting Start/Stop will continue from where you stopped when you push the footswitch after stopping.

The setting Reset Start/Stop will restart playback at the beginning when you push the footswitch after stopping.