Here are the instructions from a popular resource.
OIL LIFE SYSTEM RESETTING
With Driver Information Center (if equipped):
Turn the ignition ON without starting the engine.
Fully press and release the accelerator pedal three times within five seconds.
The CHANGE OIL SOON indicator flashes twice indicating the system is resetting.
When the CHANGE OIL SOON indicator stops flashing, turn the ignition key to OFF, then start the vehicle.
If the CHANGE OIL SOON indicator comes back on and stays on, repeat the procedure.
With Trip Computer (if equipped):
Press the trip MODE button until the light appears next to OIL LIFE.
Press and hold the RESET button for approx. 3 seconds. The oil life percentage should change to 100 percent.
Seems to me the instructions for the two different options are reversed...but that is the way the book reads.