Simply tap them when they pop up on the screen. Also you can plug in the rear seatbelts at all times.
This gets triggered when you put heavy stuff on one of the back seats, so it detects weight on the seats and tries to warn you that the occupants are not wearing seat belts.
Find this awesome podcast here: https://teslapodcast.libsyn.com
Photo by Bjørn Nyland aka TeslaBjorn.
Are you buying a Tesla and looking for 1000 miles of free Supercharging? Feel free to use my referral link: https://ts.la/remie90440