I have Apple Music family membership I would like to add my wife phone onto it and I cannot do it

Hi there, Dickie29.

I see that you're trying to add your wife to the Apple Music Family subscription you're using, and I'm glad to help.

Get an Apple Music family subscription -- To include your wife in your Apple Music subscription, you also need to set up Family Sharing. Select the "set up Family Sharing" in step 5 of this article.

Family Sharing -- This article explains how to use Family Sharing effectively.

Take care.