It will work on any page in the user talk namespace, so you can also use it on user talk archives and on talk pages of other users. Please respect the talk page guidelines when using this tool - usually that will mean not using it to clean talk pages of user accounts that you do not control.
Click the "Clean talk page" link in the "Tools" toolbar. This removes any automated messages in the edit window and adds an automated edit summary. If no automated messages are found, an alert will pop up telling you so.
Save the page.
Bug reports and feature requests
If you find a bug or if you want the tool to support removing new kinds of automated messages, please leave a note at User talk:Mr. Stradivarius.