Why would you want to stop the maintenance reminders? The tell you when to do the maintenance. There is a way to reset them once you have performed the maintenance. I believe you hold down the set/reset button on the dash and turn the ignition key to on.
The letter codes tell you what gets done when. The oil life tells when the oil needs changing. This is real, this is the 21st century. Changing oil on a mileage interval is mid 20th century. Don't do it.
It is rather easy to change the oil, change the CVT fluid, replace the engine and cabin filters. It gets harder, depending on your skill and experience to change the brake fluid. The brake pads themselves can be changed without even turning the rotors if you are willing to take that chance and go very easy on the brakes for the first week. In fact, the pads in our Insight are at 60% left at over 60k. The car has regenerative braking. When you press on the brakes the IMA generator kicks in and slows down the car. The actual brakes only get used for the last little bit of slowing.
The spark plugs last for over 100k. There are 8 of them (4 of two different kinds) and they are very expensive. You do not want to replace them early or ever use anything but oem.
The coolant is long life, like to 120k long. Always use Honda coolant when topping. (which it should not need)
You do not have you location listed in your profile, so you may have to translate the measurement I have used (you can edit your profile so your location shows under your name in all your posts)
Here is a link to a pdf of the 2010 Insight owner's manual. It is linked, meaning you can click on the blue page numbers to skip ahead. Maintenance begins on page 335 and the letter and number codes are on page 346.