There are two ways you can install a web hosting control panel on your VPS server.
1. Login to your VPS control panel then click install and under install click control panel, under control panel there are list of control panels for you to choose from. click on the desired control panel and a warning message like this will appear:
Are you sure you want to install this panel ? Data on the server will be altered significantly. This process will download and install the selected control panel on your vps. This process can take up-to 90 minutes. You may follow the installation progress via SSH
click OK and restart your VPS to have the control panel automatically installed, after installation completes then go to installation log to get details of your control panel installation.
2. Visit the homepage of your desired control panel and follow their guide to install via ssh.