How to sign over parental rights in az?

In two words - you can't.

- unless someone is available AND qualified to adopt the child.

If you simply have no contact with the child (sort of "signing off") you still are required to pay child support.

You will have to give more information.
You can not just sign over your rights or have someone sign over their rights.
Otherwise there would be a line out the door of non-custodial parents wanting to sign and stop their responsibility for child support.

First, please pay more attention to posting guidelines. The Children forum (where this was originally posted) has a Read First sticky that directs questions of a legal nature to this forum.

Second, if you had follwoed that advice and looked in this forum you would have found a sticky note that deals with this issue and hundred of threads all asking a similar question.

You CANNOT sign over your rights. ONLY a court can terminate Parental Rights (TPR). And courts are VERY reluctant to do so. Generally they will do so only to clear the way for an adoption or if the parent represents a danger to the child.

And they will NEVER grant a TPR just to let a parent out of paying support.