This article applies to 123-reg VPS hosting running Plesk 10
This article will explain how to change a subscription’s login info in Plesk.
Each Plesk hosting subscription has its own login info which is separate from your Plesk panel login details. This is what you’ll use to access your files via FTP, for example. The options that are shown under the Websites & Domains tab only apply to the active subscription.
Click on Web Hosting Settings, this page lets you change your username and password for the current subscription.
To switch to another subscription hover over the Subscription dropdown box which is located in the top right corner of the page. If you only have the one subscription on your account you will not see this dropdown.
When you return to Web Hosting Settings you will notice that the subscription has changed here. Now we can make some changes. After making any changes, click on the OK button. Your hosting settings will now be updated. Remember, this applies to only the active subscription.