When a computer is quarantined, users on that computer see a blocking page in the Web browser for every URL. Symantec recommends that you create a specific blocking page for quarantined computers. Based on your policy, the blocking page for quarantined computers can include malware cleanup information and contact information for your site's IT help desk.
You must first enable Client Scan and Cleaning. Then you can assign infected computers to the quarantine.
You may want to configure a Block Page Message Group specific to the quarantined computers.