All contributions from a user on this wiki, with the exception of blogs, minor edits in the middle of a page, or their comments one things like blog posts, must be signed with a signature. The signature can be activated by typing four tildes. If you move your mouse over your profile picture on your profile page, and click "change avatar" there is an option that says create new signature. This can be used to add some of your own personality to you signature. To make it clickable, put [] around your user name and that will automaticly link your user name to your profile page. An example of contributions needing a signature are talk page messages for articles and users.
If you see a user forgetting to sign their contributions, please remind them on their talk page. If they continue to forget, tell an admin or bureaucrat.