To charge via the app, you should note that not all public charging stations can be operated via the app.
Tap the desired charging location and when 'Overview' shows 'App', it is possible to start/stop the charging session via the app.
Via the filter, you can set to display on the map only charging locations that can be controlled via the app. Read more here
Starting the charging session
To charge via the app, connect the charging cable to your car and the charge point.
Open the app and select the charging location where you are.
The following screen opens:
Select the charging point where you connected your car and tap the blue Start charging button at the bottom of the screen.
Stop charging
Tap Activity at the bottom of the screen
Your active charging session is displayed in the Active tab.
Tap Stop charging session to stop the charging session.