If you would rather not install a spellcheck you can always just type up your response in Microsoft Word and use the spellcheck on that. But I honestly wouldn't worry about your spelling so much. I still have trouble spelling occasionaly but I only worry about it when I'm posting in the RPG or something important.
However, if it's really important to you just use Microsoft Word, copy and paste into the reply box, and press submit.
Mark Twain ~ "Let first assume that you are a member of congress, let us further assume that you are an idiot, But I repeat myself."
98% of teenagers do or have tried smoking pot. If you're one of the 2% who hasn't, copy & paste this in your signature.
"Common sense is not intelligence, common sense is simply the ability to not make yourself look stupid."
"Sharp pointy teeth" & " I fart in your general direction" & "you mother was a hampster and your father smelt of elder beries".
guy 1: - Who's that
guy 2: - I think its a king
guy 1: - Why do think that?
guy 2: - cause he hasn't got sh$t all over him! - Monty Python and the Holy Grail