Hello I fallow all the instructions and I’m till not able to use the Apple Music,

Hi emileth

welcome to the Apple (user-to-user) Community

Re: "My husband has Apple Music and he changed his plan to the family and add me

we fallow all the instruments and I’m still not able to get the service"

You may need to activate Apple Music features on your iPhone in Settings﹥Music.

Wondering what happens when you open the Apple Music app. Eg: error message / can not sign in ?

To use Family Sharing, you need an Apple ID

Apple support have an article online (link below) that may be helpful:

Join Apple Music on your iPhone, iPad, iPod touch, Mac, or PC - Apple Support

eg: says:

On your iPhone, iPad, iPod touch, or Android device

✽ Open the Apple Music app and tap Listen Now.

✽ In the upper-right corner, tap the photo icon.

✽ Sign in with your Apple ID and password.

Seems everyone automatically gets their own Library, to which they can add the music they choose.

How to: Listen to music and more in the Apple Music app - Apple Support

Previous purchases may be available in the "Library" in the Music app.

or

How to: Redownload music - Apple Support

and

What to do: If you can't find your family's shared content - Apple Support

________________________

If needed: Trouble-shooting:

You may need to receive an invitation (eMail) from your husband, and accept that. invitation.

How to: Share Apple and App Store subscriptions with family members on iPhone - Apple Support

or

The "Music Support" website has info./ support / contact (onlind chat / phone / email etc):

(There's a "get Support" link at the bottom of the webpage below:)

Music - Official Apple Support

All the best :-)