Click Create a policy.
Add a policy name.
In the Assign locations card, specify the location(s) for which you want to enable the policy. To enable it for all your locations, click Select all on the top right corner of the card.
Navigate to Custom to allow, block, or override domains. The ability to override lists of URLs and IP addresses will be released in the future.
Click Add a destination.
From the drop-down menu, choose a Destination Type.
Choose whether you want to allow, block, or override the destination.
Click Add to policy.