| This link is Not an actual (real page) link. It is a Place holder link
But were this link - [[Reg no. ?]] occurs in a table or list it should be replaced (in edit mode) with the 'name' of the actual page link required in the format of other entries in the table. e.g [[Add example link here]] is a 'dummy' link and replaced with [[Example]] in edit mode, which creates a link to the page called Example when adding an new entry to the table.
If you want to create a new page use the Create a new page link on the left below the Menu.