Director doesn't run on UNIX; you'd need to dial in to a Windows machine to do this. Once you're logged in (presumably via RAS), you're just another Windows user; connecting via Director (or any of the other DataStage clients) to the DataStage server is as usual.
Similarly, if you're set up to dial in to the UNIX server, while you don't have to do anything special in the way of configuration, you will not have access to the (Windows-based) clients. You can, of course, use the command line interface
dsjob.
Another thing you might consider is DSWebMon, which can be used to control DataStage through a Web browser. You can find more details
here.