If I'm looking at the screenshot correctly it looks as if the decline button has a timer, so if you don't press it, the new route is selected.
It's dangerous to do anything in the car, including drive.+Ian Lewis
You can use the share function to send your location to others or to yourself. I know it's not great, but its all we got... Personally I want to be able to star any location. I've sent a feature request for it, but I guess enough people aren't asking for it.