I assume he means reset the Oil Change Indicator on the DIC, after he has changed the oil:
(does the "oil light" come on if you go to long at 0% Oil Life?)
If that is the case:
1. Turn key to Accessory
2. Press "info" button on steering wheel until DIC says "Oil Life"
2. Hold down the "return" button (just below "info" button) for a couple-three seconds until "Oil Life" says 100%