Tethered type 2 plugs won't work with the Ampera. What you are looking for are type 2 sockets, these are much smaller units with usually two sockets, covered by flaps to keep out the elements. You can do a filter on the app to show you these ones. On the
map the ones that are 'F' (22kW) or 'S' (7Kw or 3kW [rare}) will do for the Ampera. With these, I used to plug the cable into the car first, hold the card to the reader until it is authorised (flap will unlatch) and then plug the cable into the socket. If you have the car set to timed charging (for off-peak if you have an off-peak meter at home) then you will need to override it so that it charges immediately. When you press the door button to open the charge port then a message displays on the centre screen which allows you to charge immediately.
I've tried to put the link in for the map which shows your area with suitable chargers showing.
Edited again, to see that I started this thread not long after I bought my Ampera and found new chargers, just lets you know that we were all new once, had to learn and,, for me, I still am.
Edited again to say to stop the charge, I present the card to the reader again, it displays a message to the effect that charging has stopped. you can now remove the plug from the charger (you may need to push it in a bit to release the locking pin) and then unplug it from the car.