Re: Disable permission to edit html-page
If you want the Basic user to not be able to edit any page, then take away the tiki_p_edit from Registered (go to Admin -> Groups, select the key icon for the group and then remove the appropriate permission)
If you just want to change a specific page and not all pages, then at the bottom of the specific page, click on 'perms' and assign the perms for that page as needed. Note that these specific perms override the default and need to include ALL perms on the page. If you assign ANY permission to a specific page, you have to assign ALL of the perms for that page.
You should look at PermissionAdmin for more details.
gary