DirecTV subscribers can receive a $20 credit for Disney channel blackout. Here's how.

Millions of DirecTV customers have been blocked from accessing Walt Disney Co.'s networks since Sunday night, with ESPN and other channels pulled during the U.S. Open tennis tournament and as the college football season is kicking off. 

DirecTV says that its customers can get a $20 credit for the blackout, but they'll have to take a few steps to qualify. 

The dispute, which focuses on the so-called carriage fees that DirecTV pays Disney to broadcast its programming, prompted Disney to pull its channels on Sunday night, with the blackout happening 10 minutes before the start of the football game between No. 13 Louisiana State University and No. 23 University of Southern California.