Start in the ⚙ gear (top-right):
From there you register as a Driver (name + photos, saved once) or save your Client name — and switch roles anytime.
Your mode is remembered — you open as Client until you register as a Driver.
Clients: tap "Request ride" in the center bar to call a driver.
Drivers: use AVAILABLE / OFF DUTY in the center bar to go on or off duty.
Open the ⚙ gear anytime to see these instructions again.