Here's a video to show you exactly how to start a round in Golf Pad.
Open the app, you'll see a list of vertical buttons. Select "start a new round".
Next, choose the course you'd like to play. The app will automatically generate a list of nearby courses. If you want, you can also search for a course name yourself.
The next step is choosing a scoring mode.
If you have additional players, add them using the + symbol in the center of the lower screen.
When you've finished those steps, click "start round" in the lower right.