Here are the steps to select or add a tee for a specific player:
First, start a round and select your course. Then, Tap next to the player who's tee you want to set or edit.
Next, tap the '+' symbol.

Finally, enter the tee details: name/color, gender, total length, course rating and slope rating. Click save.
Once a tee has been added, you can edit or select a tee using the same steps.
Rating and slope for 9-hole courses
When entering rating and slope for a 9-hole course, be sure to use the value provided by the course, usually found on the scorecard. If the course only provides rating and slope for 18-hole play, divide the rating by two, but use the full slope.