Hello wiltel,
I searched the Online Knowledgebase and found these solutions that may help you set up the new Wifi:
How to Connect Printer to Wifi Network
I've got a new router (thus new password) so I wanted to change the WIFI settings on the printer, but can't see how to do this. I thought there should be 'Connectivity' options in the 'Device' app, but there isn't. I can't remember how I set up the WIFI on this unit initially.