- Ensure that your Canon Pixma MG3620 printer is turned on.
- Then Press the WiFi button on the control panel of the printer and hold it till the light begins flashing.
- Tap the color button and the WiFi button until the WiFi light flashes for the wireless setup process.
- Go to official site and download the drivers
- After completing the download the run the .exe file
For further pointer you read this blog : How to connect canon mg3620 to wifi