You can use the Fiber TV mobile app to delete shows from your DVR.
To select and delete episodes:
Tap the menu icon in the top left corner of the screen to display the main navigation menu, and then tap DVR.
Tap the show whose episodes you want to delete. The detailed info page appears.
In the Recent Recordings section, tap Manage.
On the recordings page, tap Edit on the right side of the screen. A circle appears next to each recorded episode.
To select an episode for deletion, tap the circle. A check mark appears in the circle. To change your mind, tap it again.
At the bottom of the screen, tap Delete, then Yes to confirm. The selected episodes are deleted.
You can also delete shows using your remote from the Detailed Info screen.