From NMR Wiki

To edit a particular page: first go to that page, click 'edit' tab and type in your text, then hit 'save page button' below.
Try editing wikitext in the sandbox

Who can edit NMRWiki

Uploading Files

Starting new pages

Organizing text within pages (tables of contents, sections, paragraphs, numbered/bulleted lists, etc.)

Organizing pages on the site (categories, common sense)

Styling text (bold, italic, etc.)

Links (links wihin the wiki and outside)

Pulse sequence drawing

Mathematical equations

Inserting bibliography

HTML and CSS support

You can type plain html and it will be shown by browsers properly. It is also possible to style your documents with CSS (cascading style sheets), at this time only inline styles are possible. NMRWiki style sheet has not been yet developed.

Advanced Wiki editing

Here is full MediaWiki User documentation