Unplug all cables or connectors attached to the front of the wall plate.
Remove the two screws securing the cover plate to the wall. Pull the plate an inch or two away from the wall.
Remove screws holding any cables in place. Unscrew the coax cable from its wall plate connector. Unclip the Ethernet cable from its keystone jack.
Discard the old wall plate and remove the new cover from any packaging.
Reattach all cables coming from the wall to the back of the new plate.
Secure the new plate to the wall with two screws.