The WiFi password is printed on the information label of the router (if you have not changed it).
Or do you mean the credentials for the Vodafone HomeSpot community?
There is no dedicated WiFi password in order to connect, but you need credentials from your contract at home in order to log into the homespot network at other places. Anyhow you CANNOT connect to the homespot network at your own home - but there you have your own WiFi, so no need to connect to the Homespot network there.
