Autoconfirm is an implicit user right in the MediaWiki software that runs the wiki. Having the autoconfirm right means you can edit semi-protected pages, move semi-move-protected pages, and create semi-salted pages. By default, all logged in users are autoconfirmmed, unless you explicitly define limits in your configuration file (see here and here).
On LizardWiki, to get the autoconfirm right, you must satisfy these requirements, after which, getting the right is silent and automatic:
- Must be a registered user
- Must be at least four days old
- Must have at least one edit