From the Main Feed screen, tap the "New Round" button on the bottom bar to open the "Select Course" section.
Now you can select a course under any of the 3 tabs: courses Nearby, courses organized by Countries, and courses you have Recently played.
You can also tap the Search icon at the top right hand corner to do a Global Search.
Once you have located your course, tap the "OUT" and "IN" button to select the Out course and In course respectively, then tap the "Tee Box" button to choose a set of tees.
Once setup is complete, tap the "Start" button to proceed.