Mayra, have just found my book, but my RCA VCR is older than I remembered (no wonder it's in the closet)and has a completely different method of setting up remotes which I think is way outdated.
However, have you tried the Interactive Resource Guide at www.rca.com? I just went there and did a few searches, and it said many manuals, etc. were available online through that method. Open the back of your remote, remove the batteries, and you should find a serial number there which you can use to get to the correct manual.