Hi Brian,
After completing the TV setup in the Peel app, it should ask you if you have a cable or satellite box. Select the brand and it will run you through a similar set up as for the TV. (make sure your box is ON before the satellite box setup)
For DVR, you swipe the arrow on the right side of the screen left at the main remote page to pull up additional buttons for your cable box. On there should be a DVR button.