Usual answer
Welcome,
First, do you subscribe to Locals from Dish (LIL) on a 921? If not, that is all you will see.
Second, have you scanned for locals?
Third, you may have to wait overnight for the guide to fill.
Fourth, some subchannels are not mapped correctly by Dish and some schedules are not given to the services.
For now after channel scanning, check reception -- min 70 for 811, 85 for 921. Set up your favorites. Then you can set up recordings by choosing your 7xxx/8xxx/90xx channel and changing the number to the digital 0xx01 or 0xx02 for most PBS. (Use 9999, then scroll down and click.) If they did not map from digital numbers to analog+subchannel, then you may lose them and gain them according to signal level.
Luck,
-Ken