Hi luca2,
The WPS button is located on the router, not the PIXMA MG5520. If your router does not have a WPS button, please follow these steps:
1. On your PIXMA MG5520, go to the Home menu or press the Home button.
2. Use the arrow keys until Wireless LAN Setup appears and select this option.
3. If a 'WPS' prompt appears, press STOP.
4. Select the Standard Setup option.
5. Follow the remaining prompts on the printer menu to connect the unit.
Once this process is complete, use the disk to install the unit on your computer.
If you continue to have difficulties, please contact our support group using the following link:
http://www.usa.canon.com/cusa/consumer/standard_display/contact_us_consumer
