Deleting pages in Aneuch is pretty easy. Simply navigate to the page you want to delete, and click the edit link.
If you have edit capabilities (or if the wiki is wide-open), you'll notice a link next to the Save button on the bottom titled "Delete Page".
Click that link, and you'll be directed to answer the question "Are you sure you want to delete the page?". If you answer yes, then the page, all its archived copies, and any references to it in the RecentChanges log will be removed from your site. Note: This action cannot be undone!!
See Immediate vs Delayed Deleting.