Getting there via the App Store is just one option. You can also get there from Settings under Apple Account > Subscriptions. And if that’s too tricky, you can

Getting there via the App Store is just one option. You can also get there from Settings under Apple Account > Subscriptions. And if that’s too tricky, you can just type “Subscriptions” (shows up after just typing “sub” for me) into Spotlight Search, and it’s the top option.