Below step will help for canon mg3000 wifi setup
Make sure the printer is turned on.
Press and hold the Wi-Fi button and release it when Wi-Fi lamp flashes.
Press the Color button.
Press the Wi-Fi button once.
Press the Color button or Black button. The printer enters Easy wireless connect mode.
Follow instructions on your smartphone or tablet.
Still, if you are unable to fix this then do visit the website and follow online instruction. Here you can contact customer support as well