Just go to the "View Details" section of your Service, and then scroll down, you will see that there are three "tabs" with your server information listed. One of those buttons is the View Desktop button.
You can simply click on this button once you see it, it will open a new tab that you have to enter your password into. You must have had the Desktop option selected when you created your VPS.
You may go back on SolusVM or on your service page to reinstall your server with the Ubuntu 14.04 w/ VNC operating system, which will allow you to use this feature.
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