1. Your server details can be found in your Nimbus Client Area which you access via https://youraccount.nimbushosting.co.uk/clientarea.php
2. Once logged in to your client area click on Services > My Services
3. Now click on the server you wish to access.
4. Here you will see your servers details with a link to the control panel along with the username and password. Click on this link which will open in a new window so you can copy and past the password.