You need to contact adblock plus support for this question.

People are still welcome to try and get help with Extensions here, whether popular used ones or not.

Also if you are going to tell people they have to go get support elsewhere, how about you actually give them information on where to go.

How to unblock a website on adblock plus

I do not use this Extension however here is a help center for this extension at https://help.adblockplus.org/hc/en-us

How to unblock a website on adblock plus

I use Adblock Plus, can you provide a link for the site? You should just be able to just click here while on the site. see screenshot