Board Thread:General Discussion/@comment-4996890-20130430004541/@comment-10688548-20130430004729

That would be done by editing c:minecraftpocketedition:MediaWiki:Welcome-message-user.

Note that $1 and $3 are just variables, like X and Y in math class. $1 is the name of the page, $3 is the signature of the admin. Just place them wherever is useful.