help using pop-up : want to show pop-up when the visitor leaves + translate "never show it agai

Hi, I need help using pop-up : I want the pop-up show when the visitor leaves (not every 20 seconds or so..)
I also would like to translate "never show it again" below the pop-up as our website is in French. I did not find where to do this in the settings, thank for your help !