Hi and welcome to Justanswer.com. Sounds like you are trying to airprint to your Canon MG5520 from your iPad. Have you been able to airprint from this iPad before?
Also, if your internet cable modem was changed 2 days ago. We may need to set up your printer on the wifi again. If it is not on the wifi we should probably do that first, let me know when you can proceed.
If it is not connected to your wifi here is instructions on how to do so. However, we can always go step by step if needed just let me know. If you happen to connect the printer to the wifi successfully and you are able to AirPrint please consider to rate my service. If not, please let me know so we can further troubleshoot.
Link - http://gdlp01.c-wss.com/gds/3/0300012583/01/MG5500_NonPC_EN.pdf
So currently the printer is not connected to your wifi correct?
I have not heard from you for a while. Were you able to get your printer connect with the setup manual in PDF format visible @ http://gdlp01.c-wss.com/gds/3/0300012583/01/MG5500_NonPC_EN.pdf
If so, please consider rate my service. If not, please let me know what you need help with.