Hi mostafa,
It is not too complicated.
-Go to "Manage"/"Policy List"
- Select your exiting PCI-DSS policy
- Click on "Add Rule"
- Select "Content matches data identifier", and in dropdown menu select "Credit card number"
- Click on "Next"
- Give a Name to your rule
- Select "Narrow" (at least to start testing your policy, after that you will be able to be more restrictive)
- Select "Count all unique matches"
- Click on "OK"
- Then save your policy
Regards