you can block ppl by clicking there name (right click)in the chat box and click on block if you mistakenly block your freind all you need to do is close down your whole fiesta and then log back in then everyone you blocked is unblocked!!!
more info you have trouble entering some popular kqs? well if you press shift +z you can go into charicter hide mode this way it will limate the lag...if your still lagging the requet word when its requting try reloging right befor kq