Memory map - tech help

Righty ho, my turn to ask for some technical help:

Memeory map.

I've finally managed to install the complete? memory map version 5.0.0.0 had the computer guy here from 1000 through till 1530ish, he had to re format my comp from the start (2 years ago) and re install everything on it.

Cos I know nowt about owt, I had programs installed up to 5 times ops: :shock: and had part of memory map installed but not all.

Question now is, I can open it and browse and it seems to have all of UK on in various scales but cannot get beyond this point. How do I go to next stage without ruining it. Do overlays and such - or will this just be too advanced for me?

All replies in idiot proof format please.

Thanks in advance