If they are set to rf, just do the following on the new remote:
1. dtv
2. press and hold MUTE & SELECT, wait for two blinks, release
3. enter 0 0 0 0 1
4. press and hold MUTE & SELECT, wait for two blinks, release
5. enter 9 6 1
6. press CH UP
7. enter last 6 digits of Receiver ID #(RID), found on a sticker in the access card compartment
8. press SELECT