How to change / set a new password?

How can I add or remove more Passengers and enter or delete their data?

I’ve just bought a ticket for more then one person and I’ve received only one document!

How can I be sure that KOLEO will take into consideration my discount?

What kind of document will I need during the ticket control?

How to buy a ticket for a child under the age of 4?

Is there a mobile application version of KOLEO?