It is simple to select a study on the WordGo app, providing that you are doing a Personal Study.
First you navigate to the 'Profile' icon which at the bottom of your screen. You then select 'Course Library'.
You can browse the available studies and by clicking on one you open up a helpful description preview. Once you have found the course you want you can click on 'Start Course.'
If you need any further assistance please raise a ticket here to contact a WordGo customer support agent.