To access and use AWI's HPC systems login via a terminal is needed, using ssh.
Although, in general it is possible to use tools with a graphical user interface (GUI) remotely via ssh, some basic knowledge on how to use the shell is required.
We advise all new users who have never worked in a shell on a Unix-like system to go through this nice introduction: https://swcarpentry.github.io/shell-novice/
This tutorial is a good starting point where you learn to navigate in the filesystem, manipulate files, and create and run scripts.