Wiki has two levels of permissions: site level and page level. Site level permissions are the default permissions for all wiki pages. However, permissions can be also changed for individual pages at the page level. For example, you can alter permissions so that the wiki is editable by everyone, except for one page which can only be edited by instructors.
There are 5 types of permissions within Wiki:
Note: Wiki permissions cascade downwards. For example, you cannot update a page if you cannot read it, so it makes no sense to enable "update" but dis-enable "read". If you enabled "create" or "update", Wiki will assume that you want "read" permission enabled as well.
Select the Wiki tool from the Tool Menu of your site.
Select the Info button to view the information for the page you are currently viewing.
Note: The permission options selected here will apply to the current page only.
In order to edit the default permissions for all wiki pages in the entire site, click on the edit site permissions link just below the page permissions grid.
Note: You may see different roles listed depending on the roles which exist in your site. A role must be present in the site in order for you to modify its permissions.