i know this was posted months ago, but in case you were still looking for a response, if you've been messing with it for over a year and you can't find a single sound you like, don't bother. in fact, i'd be inclined to tell you that you've wasted a whole year, essentially. for the most part, you really aren't going to get a good tone out of a tiny amp like that, particularly if it's solid state (which i'm assuming it is). a good equalizer can really do wonders, but if your amp is crap, then you're just wasting your time.
my suggestion to you is to pick out a few bands you like and see what their guitarist plays through. there are ways to emulate certain tones that won't cost you an arm and a leg, but since i don't know what sort of tone you're looking for, all i can do is recommend you talk to someone about it at your local guitar store.