Oh, how I've come to fear such words . . . they usually indicating a trawl through the darker recesses of the web (with little or no hope of a solution).

Your remote appears to be a generic model that was originally supplied with a number of VCRs.

Being generic you'll need to locate a manual for a model of VCR it was supplied with, though what level of TV instruction said manual may include (assuming one can find one - I've not had much success) is somewhat moot.