@Ugis Upenieks Welcome! Thank you for your topic. You want to connect to a KPN Fon network nearby you, or do you want to connect to your wifi at home? 
What ‘error-message’ do you receive when you try to connect to the KPN Fon network? 
 

@Ugis Upenieks I havn't heard from you, so I assume that meanwhile, you solved the problem by yourself or though another channel. Otherwise I would like to hear it!