If you do not know how then you can follow the tutorial available here: https://virmach.com/connect-vps-first-time-via-ssh
The commands you'd need to run in the terminal to install the software are:
If you get errors regarding "sudo" then please run this command: apt-get install sudo
sudo apt-get install software-properties-common -ysudo apt-get install oracle-java8-installer
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
// Verify it's installed.
That should cover it, as always if you have issues please contact our support.