How do I change a tee time from 9 to 18 holes?

This article describes the process to change a golf reservation from 9 holes to 18 holes.

From the tee sheet, select the golf reservation you wish to edit by touching anywhere on the row for that tee time.

This brings up the Reservation Details screen. Note that the indicators for number of holes to be played are set to 9 holes, both for the group as a whole as well as for the individual players.

To change ALL players in the group to 18-hole players, select the 18-hole option for the group at the top-right. 

To select a mix of 9-hole and 18-hole players within the same group, choose the appropriate setting for each player on the individual player line.