And likewise, I don't see yours.
Honestly, I would think you're trying to whitelist the domain, not "domain URL." If you read the instruction under domain URL, it states that's used to download a list. The instructions under Whitelisted domains clearly states:
Individual domains to be whitelisted
I would add it there.
For more detailed information, ask it's creator, @dibdot; and/or see the Adblock support thread.
Hope this helps.