Hi there and welcome
you will need to reinstall the printer onto your new wireless network as you now have a new one with this new router
To do this, connect the printer to the computer via the USB cable and run the installation again like you did when you first received it.
One of the steps during the installation is to connect the printer to your wireless network.
Do this and when complete, you can then disconnect it and print to it wirelessly again as it will be on your new wireless network.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please