I think this is temporary, though. In linux there is a file in the users home directory called .bash_profile which is basically a shell script that runs when the user logs in.
If Panther has this file as well you should be able to just add the "export PATH=........" line to that file using a text editor.
you can also look for a .profle file in your home directory. Also, if you are more familar with other shells, you can change the default in Terminal -> Preferences. I'm still upset they don't ship full korn shell (ksh) but I can deal.