What is the procedure for signing over my parental rights

First its not a good idea to piggyback your question on someone else's. This can lead to confusion. You should start a new thread. So I've moved your question to its own thread. This is one of the reasons you didn't get an answer previously.

You can't just sign over your rights. A court has to terminate your rights. And courts are reluctant to do so unless its to clear the way for an adoption or because the parent represents a danger to the child.

And even if the court DID allow you to sign away your parental rights, your parental RIGHTS and parental OBLIGATIONS are two different things.

You would STILL be paying child support, unless the other parent is married to someone who wishes to adopt their stepchild.