• Page names: As a page name you can choose something similar to 'My Pagename'. Note: the first heading in a page is considered as the page title and is also shown in the navigation.
• Namespaces (Folders): Use namespaces to restrict access to certain pages. A namespace is similar to a directory or folder, while pagenames are similar to files.

• Links to other pages: Use wysiwyg editor and choose the desired page.

• Create new page: Right click on the menu item on the left under which you want to create the new page and choose 'New page here'
• Edit a page: Right click on the menu item on the left and choose 'Edit' or click on the settings-icon on top right and choose 'Edit this page' to edit the current page.
• Delete a page: Edit the page and remove all it's content, then save it.
• Change permissions for pages: Right click on the menu item on the left and choose ' ACL '

Creating a new folder/namespace under wiki→Client Area

• Right click on the navigation link 'Client Area'
• Choose 'New page here'
• Put the folder/namespace name in front of the page title followed by a colon (:). Example: New Folder: New Page Title

If you want to have a human readable title for your created folder/namespace which shows up in the navigation on the left, you need to right click on the folder, then choose 'Headpage here' and insert a Heading 1 title in that page

Official Documentation: http://www.dokuwiki.org/dokuwiki