Help is outdated. How do you transfer an incoming call?

The Ooma Office app help page says to transfer a call:
“To perform a blind transfer from the Ooma Office mobile app, you should:
Press the Transfer button on the active call screen.
Choose a user from the company directory.
Press the Transfer button.
The call will automatically disconnect.”

#1 Question: Where is this “TRANSFER BUTTON”? On an iPhone, the unit rings, the phone is answered pressing 1 to accept and then you are on the iPhone Phone interface. There is no “TRANSFER BUTTON”