~/.emacs開いて
(autoload 'navi2ch "navi2ch" "2ch interface for Emacs." t)
てな感じのさがして)のうしろでC-xC-e

FAQのこれはだめなの?
Q. connection failed: operation already in progress, navi2ch.sourcefoge.net,
navi2ch connection って出て起動できないんだけど…。

A. とりあえずこうしとけば？

(setq navi2ch-open-network-stream-function
#'navi2ch-open-network-stream-with-retry)