Changing servers

Some how I cant play PVP against my friend, I think it is due to our difference in servers. It could alsi be that I am in the 2nd tower and he's still in his first, but i don't know. We want to try PVP out for fun, any solutions? Can i change servers?

You both have to be on the same floor to pvp

You both have to be on the same floor to pvp

Thanks