Thank you for bringing this to our attention, Abuela06! We want to ensure that you're able to enjoy the benefits of your chosen plan. Attached is the link to our Apple Music FAQs page. Item 6 of said page provides instructions on how to add the feature to your account. Please let us know if this works for you!
Here's the aforementioned link: https://www.verizonwireless.com/support/apple-music-faqs/ . MatthewI_VZW