Latest questions about "match"

I am at level 71 and don't know how to clear the 4 symbols in the bottom rectangle that sits apart from the major portion of the game. What is the strategy for doing it?

Can I match my Skype account with my Yahoo account?

It doesn't let me play. Why? When I go on and push play it starts loading and then it either kicks me out, or it is debugged, or just keeps on loading without playing.

I already have Ultimate Mahjong 10 but was notified that 15 was available but it won't let me get it. I have Vista and have been running the version 10 all the time so what's the problem?