I have question about my iTunes Netflix

Leahel,

Netflix no longer accepts new or rejoining customer billing thru iTunes. Get the app as Raicya suggests and then start a subscription directly thru Netflix. See details here: https://help.netflix.com/en/node/25097

Check here.

The app is free, there is no free trial, you need to have a subscription.

Netflix membership is a month-to-month subscription that begins at sign up. You can easily cancel anytime, online, 24 hours a day. There are no long-term contracts or cancellation fees. We just want you to love what you watch.