After you followed the registration process, described in Access to the bwForClusters, you can login to JUSTUS with the SSH protocol.
ssh <tu_ZDV_User_ID>@justus.uni-ulm.de
For a graphical representation use the Option-flag "-X":
ssh -X <tu_ZDV_User_ID>@justus.uni-ulm.de
Further information how to use the resources of the bwForCluster JUSTUS go to: