Subscription and payment

Mrleoncauley85 wrote:

He is on my account

This practice should be stopped immediately.

Each and every person, regardless of age, needs her/his own, unique Apple ID.

The person acquiring a new ID should thoroughly cleanse her/his Apple device(s) as follows before “moving in” using the new ID:

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Family Sharing, including sharing subscriptions, is available.

What is Family Sharing? - Apple Support

See this article.

Add a payment method to your Apple ID - Apple Support

If it still doesn’t work, tell us everything about the scenario - what was attempted, what was seen, error messages, iOS version, pertinent information about country/region, etc.

I don’t understand exactly how you arrived at the screen you’re displaying. Try Settings > [your Apple ID] > Payment & Shipping which should take you to this screen as shown in the article I linked above.