You can whitelist (or block) any domain in your R.O.B.E.R.T. settings. You can find them by logging in on our website, going to the "My Account" section, and selecting the R.O.B.E.R.T. tab. Then go to "Custom Rules" and add the domains you wish to whitelist (or block).
Here is a quick link to this page: https://windscribe.com/myaccount#robertrules (you will need to login first).