If you click on the Carista link that scubapr posted, you'll see all of the options and it's as straight forward as it could be. It's literally plug and play and if you really can't figure it out, ask someone to help.

When I bought the OBD, it also came with a 1 month? or 2 week trial or something if I signed up for 1 year. Honestly, you'll get over the excitement and finish all you need to do in a day. I signed up for another trial the following year with my iPhone (previously had an Android) and cancelled it again right before it ended. And I've realized that like 90% of the features in Carista can be done from the car settings itself.

I got Carista and a 1-month trial and found it's exactly like Lesley said. It was a godsend to shut off the maddening rear seat belt chime for the center seat that couldn't be silenced even though there were people seated only in the outboard seating positions. Exactly as an earlier poster said, the dealer refused to shut it off for liability reasons.