To tell you the truth I am not sure, all I did was write down (by hand, how primitive) all the screen names I found on the original thread and then type them in in the ‘post reply’ box somewhere — anywhere on the thread, with a semi-colon in between each and then send.
think you can highlight the names and save them somewhere although I have not tried that.
I mean, hit ‘post reply’ and then type in all the names and hit ‘send’.