Well, i finally found out how to install Amsn
First install the newest version (it only comes in binaries, not rpms at the moment though)
Look if you got TCL/TK installed (try running WISH command)
If not, install the newest version (always handy to keep your system up to date)
After this, use your favorite text editor to change 1 value in of the AMSN file used to start up AMSN
In the first line it uses the wish command but with the new TK the command is changed to WISH8.4 so edit this one in. After this, it whould all work like a charm