this is what my RCA Universal Remote pamphlet says to do:
1. Turn on the device you wish to program (TV, VCR, or Cable Box)
2 Press and hold CODE SEARCH until the indicator light lights then release CODE SEARCH.
3. Press and release the device button for the device you are programming(CABLE,VCR, or TV). The indicator light will blink once.
4. Press and release OFF/ON until your device turns off.
Important: You may have to press OFF/ON up to 200 times.
5. When your device turns off. press the ENTER button.