Hi there,

First thing to do, obviously, is to physically check that the pressure on all four tyres is set to the correct level. Then you'll need to reset the tyre pressure monitoring system. How you do that depends on which infotainment system you have. 

For the higher-spec system, there are buttons under the screen either side of the volume knob. With the ignition turned on, press the far-right button with the car symbol on it to access the vehicle menu. Then on the screen tap "Under inflation initialisation" and then "Yes" to confirm it. Then it should reset itself when you next drive it. 

The process for the lower-spec screen is the same, but the vehicle menu is accessed via a button on the right of the screen itself.