1. Unplug one of the receivers just to be safe.
2. On the receiver that's not unplugged, turn the power off via the front panel power button. When you do, you'll see a floating screen saver saying "Press Select to Continue".
3. On the front panel, press the channel down OR up. You'll see the System Information screen pop up.
4. Grab the remote with a blue TV2 marking on it that you'll use with that receiver. Press and hold the "SAT" key on the top left of the remote control.
5. When all the other lights blink, let go of the SAT key. SAT button'll start to blink on its own.
6. Choose a remote address from 1 to 15 that's not the same as the other room's. Choose an unpopular number, like 12 or 14. Key in that number.
7. Press the # key. If you entered it correctly, the SAT light will blink 3 times.
8. Finally, press the "Record" key right above the "2" key. Watch your screen for the TV2 Remote Address. It should be what you just keyed in.
If you have no problems doing this, go ahead and program the second receiver's TV2 Remote Address as well if you think you live near someone that also has a UHF-enabled DISH receiver. But this time, don't do step 1. Step 1 is to ensure that you don't accidentally program the other receiver's remote address inadvertently. If you follow all the steps above, you don't need to unplug the other receiver.
I hope this helps.