Make sure you switch your view to Advanced View Mode. 

After that go to "Settings > Blacklist Settings". There you need to enable the Zaxaa blacklist feature.

If you want to disallow specific person(s) from buying your products, then you need to enter the person(s) you want to disallow. You can choose between to blacklist their domains/emails/IP Addresses/usernames.

To blacklist affiliate(s) from promoting your products, you can do the same thing by filling in the provided column on the "Manual Blacklist Affiliate" option. You can choose between to blacklist their domains/emails/IP Addresses/usernames.

You can also blacklist customer(s)/affiliate(s) automatically by enabling the Zaxaa platform blacklist. Platform blacklist is where you can blacklist customer(s)/affiliate(s) automatically if there are any other sellers on Zaxaa platform who have already blacklisted the customer(s)/affiliate(s). This will allow you to blacklist customer(s)/affiliate(s) with the certain condition that you set up.

You can find the details of how to blacklist customer(s)/affiliate(s) in this tutorial video: 

How to blacklist/ban customers and affiliates

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