To be able to move pages yourself, you must be logged in and you must have an (i.e., generally you must have had the account for four days and made at least ten article edits with it). If you cannot move a page yourself because of a technical restriction, and you expect the move to be uncontroversial, you can list it at the technical section of requested moves. Otherwise, you can make your request at its section for controversial and potentially controversial moves.
To move a page:
Please perform appropriate post-move cleanup after a successful move, as needed.
Non-administrators cannot complete a move where the target page exists (except sometimes over a redirect). If the user is not a page mover, moving the existing page out of the way will not help, as it leaves behind a redirect which cannot be overwritten either. Administrators can delete a page and move another page to the deleted name, in one step. Page movers can move the target page to a new location, move the intended page to the location, and request deletion of the moved page.