I need a simple hack that lets me edit who the poster of the message was

I have about 300 messages from a different email board that i want to just copy and past then edit the poster.

I can't for the life of me figure out how to modify it any other way.

There isnt a way i could find in admin to edit a single post all the details. It says originially posted by X but you can't change x.

Can someone please make a simple page I can enter the threadid # and it will let me set per post in it who posted.

Thanks

Probably simplest to use phpMyAdmin: http://www.phpwizard.net

But it doesnt save it in an easy to use format
and if 2 posts on the same thread are by the same person I have no idea how you tell what post belongs with what user.

Its just a big field of text for the posts seperated by blank lines.

Unless I am not looking at the right area.

Any help would be appreciated.