If you want to work in Vecsés, choose Vecsés in the application before going online.
If you work without a scheduled hour and want to change the delivery area, all you have to do is switch yourself offline and select Vecsés before going back online again.
Also, if you work in Vecsés you must be within the zone shown in the image below. In this case, you only need to deliver orders from restaurants within the Vecsés zone.
The hotspots are marked for you on the map below.
Vecsés delivery area: