First, connect to the wiki. If you are using the 9gridchan public grid it should already be mounted. If not, execute
srv tcp!wiki.9gridchan.org!wiki gridwiki /mnt/wiki
and then start acme. Within acme, type
Wiki /mnt/wiki/
And then highlight that text and middle-click.
To follow wiki links, right-click page names inside square brackets: sandbox.
You can edit any wiki page, then click Put in the acme tag to save your changes to the server.
To add a new wiki page, click New in the acme tag, then type the title in the first line of the resulting window, followed by a newline, then your content for the new page. Use Wiki syntax for formatting.