The best way to learn guitar and use Yousician without interruptions is to go premium. As an iOS user, you can still create a Stripe subscription by going to "Settings" >> "Profile" and click "Edit Profile":
This will open a new window on your default browser. There you can subscribe to the plan you wish by clicking "Get Premium":
Choose the desired instrument (or all!), select the plan, enter your payment information and click "Go Premium":
Voilà! You now have a Stripe subscription that you can manage at anytime through the "Edit Profile" page. You will also be able to contact us directly if you have any problem with your subscription.