How do I access the tuning on a Goodmans 205N TV?

My old Goodmans 205N has 2 channels tuned in, but I can neither affect them (colour, brightness etc) nor tune in any more channels. I've a URC22B Universal Remote & have found the code for the TV, but can't work out which combination of buttons (if any!) will unlock the set's functions. I'd be extremely grateful for any suggestions - & no, I can't afford a new TV!!