It does not allow me to select the geographic location
Do you use Enketo Web Form or Collect?
May be the Help Center article can give you some hints on the different features https://support.kobotoolbox.org/collect_gps.html
@Roger963, did you press this button, as shown in the image below?
Are you sure you have 1) Internet access, 2) GPS on and 3) Location allowed for the App.