Look it up in your owner's manual. I don't have a 2006, but it probably involves pressing the message selection button down until the you have selected "oil life remaining." Now that you are looking at "oil life remaining" I think (but do not know certainly) that you hold that same selector button down for 10 seconds until the oil life remaining numbers BLINK. Let go of he button, then push the button again for 5 seconds. That SHOULD reset your oil life data. But it's in your owner's manual.
a illustation of odyssey 2006 engine
How do you reset change oil indecator for caprice 2006?
2006 honda odyssey engine oil drain plug torque
reset oil chang light of 2006 BMW 750li
from 2004 and newer they do not have oil filters, your 2006 does not use an oil filtrer.
5W20 Mobil
Oil Change Time
In order to reset the oil change light on a 2006 Hyundai Tuscan you need to take the car to the dealership or your local oil changing station.
According to http://en.wikibooks.org/wiki/Automobile_Repair/Honda/Odyssey/Change_engine_oil_and_filter, you need 5 quarts of oil.
Milage... The counter tracts milage ...about 8,000 kms from 100 % to 0 %
When you see the Change Oil light on, push and hold the button just like you would to reset the trip counter
change the oil