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From WP:SUBPAGES:
How to delete a user subpage
editIf the page is your user subpage, you can easily request deletion by adding "{{db-userreq}}" or "{{db|reason}}" to the top of the page.
Alternatively, you might consider simply making the page redirect to your user page. This is normally sufficient for most people's needs. There may however be a reason for the page to be kept.
Only tag for deletion your own personal pages, and only if you have a genuine reason for requesting a personal subpage of yours be deleted.
Pages which have formerly been in a different namespace and moved to a subpage of the user namespace may not be deleted in this way. These must be listed either at Articles for deletion, or if they were not found originally in the article namespace, at Miscellany for deletion. On the other hand, if you would just like them to be moved back, then by all means ask at Wikipedia:Requested moves.