After ordering your VPS you’ll receive the default root password for your VPS via the email address associated with your account. This password can be used to log into your VPS via an SSH client such as Putty with the username root and the IP provided next to the title Main IP, or through NoVNC from the VPS Panel using the same login details.
It is highly recommended that you change the password. Here is a how-to article on how to do that from within your VPS.
The “Change Password” option within the VPS Panel is currently broken and will not change your password when used!