Then this isn’t the subscription for you quite yet! This is really designed to learn iPad lettering with the Procreate app.
You need an iPad Pro or the most recent iPad (6th Generation, 2018, etc), and Apple Pencil, and the Procreate application. The Procreate application will work on any iPad and Procreate Pocket application will work on the iPhone BUT to get the best results, you do need one of the iPads listed above.