[AUCTeX] (no subject)

[address@hidden]

Hi
I have installed emacs, emacspeak and auctex
I wrote a tex file, I saved it as file.tex, then I tryed to view it, but I have 
an error 'you must set tex-dvi-view-command' . I saw a message in witch someone 
suggest to set this variable with
(setq tex-dvi-view-command
 | (if (eq window-system 'x) "xdvi" "dvi2tty * | cat -s"))
but I am new with emacs, where do I must write these lines?