First post updated to correct mistakes. :sorry:
1. Change "*****" to "modcp" in your postbit template (or whatever your moderator cp directory is).
2. Change "field40" in your postbit template to your "Warning" profilefieldid.
3. Change the name of the new template "warning" to "warn".
Sorry about this. I have updated the first post to Version 1.1 to signify the changes. It should work fine now.