After click Connect, the user interface of your VM will be displayed in your browser. By default, Rapid.Space VPS provides a Debian installation guide, you can follow How to install default Linux VPS to install the Debian OS. If you prefer to install other operating systems on your VPS, please read the following lectures:
HowTo Deploy A VPS With A Different Linux Distribution On Rapid.Space
HowTo Deploy A VPS With Windows On Rapid.Space