This article applies to 123-reg VPS hosting running Plesk 10
This article will explain how to create and manage User Roles in Plesk.
Each Plesk hosting subscription has its own login info which is different to your Plesk Panel login credentials. These details are what you need to use to access your files via FTP.
The options shown under the Websites & Domains tab will only apply to the active subscription. On the Web Hosting Settings page you can change your username and password for the current subscription. To can switch to another subscription by hovering over the Subscription dropdown box in the top right-hand corner of the page. If you only have one subscription on your account you will not see this dropdown.
When you now return to the Web Hosting Settings notice the subscription has changed there. Now you can make some changes. After making any changes you will need to click on the OK button. The hosting settings are now updated and remember that this applies only to the active subscription.