You can remove users from your Cloud Safe service via your control panel.
Please note that this will delete any backups that user has created.
After logging in, select the Backup Service link in the top menu (if you have more than one service on Gradwell Cloud and this link doesn't appear, you may have to select your Cloud Safe subscription using the dropdown menu in the top right hand corner first).
Your Cloud Safe management console will load. Select the user from the list by clicking the checkbox next to their entry.
Once selected click Delete.
Please be advised once you have deleted the user, any data backed up by them will be lost.