To save your changes:
Select a policy in the Policies List page.
Make required changes to the policy and rules.
Click the Save Changes button to save all changes made for all objects and rules in the policy.
An Activate Policy dialog box appears.
Select Yes if you wish to activate the policy.
If you want to return to the previous saved version of a rule:
Make changes to either the policies or the rules
Click the Cancel Changes button.
Changes made before you click the Cancel Changes button are not saved.
Use Activate when you want the rules you see to be the ones the Screen uses to filter traffic.