The HPC is a command line only system. You will need to type in the commands to perform actions.
Please see the Introduction to the Unix Shell for HPC Users course material for a background.
The typical commands you will use are:
cd: for changing your working directory
cp/mv: for copying or moving files/folders
rm/rmdir: for deleting files and folders
nano/vi: nano is an easy to use text editor which vi is a powerful text editor, it is difficult to use