Userboxes should only be placed on a Wikipedia user's page or, in some cases, the talk page of an article.
Using a userbox is super easy: just copy the Wikitext from one of the userboxes above and paste them on your user page. Wikitext is basically the syntax of the userbox. The method through which you can use the userbox is called transclusion.
If you would like to see other Userboxes by Wikipedia and other Wikipedians click here.