I have a wiki page in the wrong namespace/I have a wiki page with the wrong title. How do I move my page?
You will have to…
cut all the text from the old page (save it as empty to delete the page) and then
paste it into the new page and save.
After that, update the backlinks for the original page by editing the pages that link to it. The backlinks list is linked at the bottom left of each wiki page.
To create a new page, see: FAQ: How do I create a wiki page?.