Begin creating filtering policies which you can assign to specific users and/or groups by following recommended Best Practices in Configuring Policy. The next few articles cover the basics of creating block and allow (accept) policies. You can test most of the block/accept policies you create as described in Policy Rule Checking.
The BLOCK/ACCEPT pages in the web interface provide a wide range of filters that enhance the default spyware and virus detection capabilities of the Barracuda Web Security Gateway. Note that application filtering is supported by the Barracuda Web Security Gateway appliance, but not by the Barracuda Web Security Gateway Vx virtual machine.