Bigbl5, thank you for your reply.
You asked:
1. Did I try contacting Musiopia?
Yes I sent app developer Musiopia a message. I asked Musiopia why haven't I been prompted to purchase Monthly or Yearly Subscription?
My answer:
Their reply is nothing they never responded to my request for assistance, maybe it's a glitch and they never received my request for assistance.
2. Latest App version?
My answer, yes just updated couple of days ago.
3. Are you sure that EVERY stage one lesson has a check mark and is dimmed? A
My answer Yes all lessons and songs completed.
4. Are you having the problem where your "Play 3 songs with A & D with a self assessment of 2 stars or better" lesson won't clear?
My answer: Nope it's cleared.

.
5. Both only use A and D - be sure to give yourself 2 stars.
My answer: Yes to a 2 stars.

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My dilemma seems to be that I can't, subscribe to either options monthly or yearly. Even though I've download the app on 2018 iPad Pro.
I'm just bewildered and can't figure this out can someone here in the community please do a tutorial on how to subscribe for App Full Access???
Remember this, I want this app to be a success for myself and for the community I won't give up as I posted in an earlier post to this thread 2600 5 Star reviews for the Android version proves to me that this app is great and I will get my subscription for Full Access activated.
Thanks everyone for your replies.
Peace.
P.S. Bigbl5, please tell me how did you subscribe to a monthly or yearly subscription?
1. Were you prompted to subscribe when you downloaded the App.
2. Or did the App prompt you after having completing Stage 1 Lessons and Songs?
3. Did you get Full Access, immediately after downloading the App, or after completing Stage 1, and did you immediately receive a prompt to subscribe for either of the 2 choices monthly or yearly?