As usually, copy this directory under the ~/.tkabber/plugins directory
so that you get a hierarchy like this:
  ~/.tkabber/plugins
  ~/.tkabber/plugins/killerfeature/
  ~/.tkabber/plugins/killerfeature/killerfeature.tcl

Restart Tkabber, to get the plugin loaded.
Now you're able to delete your active XMPP accounts via the
"Delete account..." entry in the "Tkabber" main menu entry.
Consult the README file for the details about using this plugin.

