First of all, you need to open a ticket via TrackIT which includes your request to access the HPC clusters. In order to have access on clusters, your mentor lecturer should approve that you may have HPC account. You may specify the approvement of your mentor lecturer on ticket or you may either add him/her on carbon copy.
Here you can find the detailed documentation of HPC User Guide. It’s recommended to read this file before you start using HPC systems.