First you need to get into this using putty or something like it.
Have your server IP and the port number for ssh (default 22)
If you did not login as root, now is the time to elevate:
apt-get -yqq update; apt-get -yqq upgrade; apt-get -yqq install git lsb-release; \
git clone --recursive https://github.com/QuickBox/QuickBox QuickBox &&
Don't put it off too long...
After install you will be prompted to restart server this will mean re logging in with port 4747