Go to Admin and select Blacklist:
...
From here you can search your blacklist as well as add to it.
Add to Blacklist:
...
You can either import a file via CSV by clicking IMPORT FILE or add who you want blacklisted individually by clicking the + button.
...
When the + button is selected, a dialogue box will pop up which will allow you to specify what you want blacklisted; card bin, country/state, phone number, email address, IP address, and address.:
You can also blacklist individuals from Cash On Delivery (COD) orders only by checking the box Blacklist from Cash On Delivery (COD) Only.
...
Address Blacklist Strengthening:
...