There are 3 different ways to save a waypoint in Goat Maps.
At your current location
To save a waypoint at your current location open the Tools tab, then select "Waypoint My Location", after saving the waypoint you will have the option to customize the waypoint, or leave the defaults and customize it later.
Choose a location on the map, or enter coordinates
To create a waypoint by choosing a location on the map or entering coordinates open the Tools tab, then select "Waypoint Map". To choose a location on the map drag the map around, the waypoint will be created at the point under the crosshairs. Tap the checkmark button to save the waypoint, or the X button to cancel.
To choose a waypoint icon or color tap the Pin button.
Tap the map to choose a location
Tapping any location on the map will bring up info about that location. Tap on the Waypoint button in the Location Info sheet to save a waypoint.