Admin Post Editing plugin for 1.6?

[katib]

Thanks for prompt reply
now plugin is activated correctelly, however I still have two problemes:
1- Due to first unsuccefull intall, I ended up with two Admin Options box in ditpost page :
2- when I entre the new poster's username, and  check "Post is made by a registered user" click update, it gives:
The specified username could not be found!