All our VPS machines have SSH enabled by default to enable easy access.
Once your VPS is provisioned and you have your IP address and login information you can then use SSH to login.
All distributions use root as the username so to login you would use the following
You need to substitute the IP with your public IP address.
If you ever lose SSH access you can also use the noVNC console conntection via the cloud dashboard to regain access or simply reinstall the OS