Wikipedia:Tip of the day/December 15, 2007
Sign your messages with ~~~~
To prevent readers from getting your posts on talk pages mixed up with those of other users, be sure to sign your posts! When you edit a message, there is a row of square buttons at the top of the edit box. One of them looks like a signature: 
. Click on it, and four tildes (~~~~) are inserted where the blinking cursor is. When you save the page, those are automatically converted into a link to your user page followed by a date stamp. You can also type in the 4 tildes manually. To sign without a date stamp, type in three tildes (~~~) instead.
Bonus tip: you can customize your signature in your preferences menu.
Read more: Wikipedia:Sign your posts on talk pages