You can now invite someone to your server but restrict them to specific websites, this is useful if you want to give a client access to their site but make sure they are unable to see or make changes to any of your other clients websites.
Firstly, click on the 'Servers' link on the left hand side of the screen in the blue section and select the server where the website is hosted . Then from the dashboard click on Users
Click on Add User
Type in the email address of the user you want to invite and tick the Restrict access to the Website level box, this will then allow you to choose which website you want to restrict them to via a drop down menu, after this click the Invite User button
After this we will fire off an email to the email address you specified, the user will need to click on the invite link in the email and complete registration of their account.