How do I restart the app?

iPhone

If you have an iPhone with a "Home" button, tap it twice fast to get the list of recently used apps up. From here you swipe Reshopper upwards making it disappear from the list. 

If you have an iPhone X or newer, swipe up from the bottom of the screen to get the list of recently used apps up, from here you swipe Reshopper upwards to close it.

Return to the Home screen and open Reshopper.

Android

Tap the square menu icon in the bottom of the screen to bring up the list of recently used apps. From here swipe Reshopper left or right making it disappear from the list. Return to the Home screen and open Reshopper.

TIP: On some devices (Samsung) a long press on the Home button is required to bring the list of recently used apps up.