I have a Csnon Pro series 100 no aiprint?

It is listed as compatible from the Apple support page linked above.

To double check the information, I turned on my Pro-100 and it shows as an AirPrint option.

Be certain the Pro-100 is connected to WiFi and the iPhone is connected to the same Wifi network.

It should be Air Print compatible.

About AirPrint - Apple Support

Just to add, it might also require you to restart your WiFi router.

You are welcome.