Here are instructions on how to create new wiki pages on this wiki: www.dokuwiki.org/page#wiki_pages

Here are instructions on how to edit pages: www.dokuwiki.org/editing

A page showing syntax for editing wiki pages: Formatting Syntax

Unlike the usual URL links, such as HTTP, FTP, mailto, etc, Gemini links don't work in the wiki, because it appears to not understand the protocol (which makes sense, Gemini is not widely accepted yet) but if you don't surround a gemini link in the link markup syntax with double brackets, dokuwiki will consider // as “start italics” and mess up your document.

so if you type [[gemini://gem.sdf.org]] inline in wiki markup, it will render as

gemini://gem.sdf.org

but if you just type the url straight, as gemini://gem.sdf.org, it will be displayed as:

gemini:gem.sdf.org