Pls help, I clicked to button create a new page, but I can't text there!
If you did that in your user, it will give you "No such special page". I once added a page in FandomDesktop in a page already, and it's worked. Try that.
Please give a link to the wiki you're working on.
For your information: Help:Editing
If you need help, you are going to have to provide more information.
What do you think?