So let me preface this by saying that I'm not a very experienced rider, so that may factor into whats happening.

Anyway got a new bike last week. They did a very basic fit, but not a full fitting. I can't afford to get a full fitting at the moment so I'm hoping to adjust this myself if at all possible.

I seem to keep winding up sitting more in the middle of the saddle, instead of on the wider part. When they had me in the trainer they said my angle and reach looks good and stuff, and the seat seems to be set level. And when I sit on the wide part, I don't feel like too much weight is on my hands. But yet I still slide forward and then my under parts start to not like it.

Anything I can try to fix ? Should I move the saddle forward and/or tilt it up?