If you leave out the user name, it defaults to the user name of the talk page it is used on.
Before saving, remove the old talk page content.
Method 2
This one will not require {{REVISIONID}}, and looks better, but has more steps.
Remove all of your headings (including the archive box) and replace them with {{archive}} <br /><b>Archive ID</b>:{{REVISIONID}}
Copy down the "Archive ID".
Undo your edits- but don't save it!
Remove all of the content of your talk page, use the template as described above.
Fix your edit summary and save.
A benefit to permalink-based archiving is that it archives pages only when needed, such as when the page gets full. This is good for slowly-expanding pages, where a time-based archiving system is unfeasible.