User Sub Pages
Many users like to create sub pages to store various bits of information such as welcome templates or other information. To create a sub page simply visit your user page and then append the name of the subpage in your browser's URL bar. For example, http://en.wikipedia.org/wiki/User:CoolDude would become http://en.wikipedia.org/wiki/User:CoolDude/MySubpageName. If you no longer need a sub page, or wish to have it deleted, you can mark the page with {{db-owner}} or {{db|reason}}.
Read more:
Wikipedia:Subpages