Does anyone know where I can go to register for free so that my adopted daughter can find me if she decides to look for her biological family?

Adoption.com, adoption.org and ISSR all have reunion registries.

You can also check with the adoption agency used, and the courthouse in the county she was born to see if they have a fee for leaving your contact information for her if she decides to look for you.

I'm looking for my birth father and have hit the same wall sadly . Everything is register or pay or both