Airprint Issues

[arrymong]

Morning All
I have connected my Mother in Law's Ipad and Iphone to her new Canon Pixma wi fi printer. I am able to print her pictures with Gay abandon but everytime i try to print a document (i.e. Email or attachment) i am told that it cannot find an "Airprint printer". I cannot find how to change the default printer or how to disable the Airprint facility. Am i just being a dick? My android phone connected and printed in 5 minutes flat but i am unable to print any text from Apple devices after bloody hours of research on Google. Help! I am using the Canon Print App from the app store.
Thanks

[Buenchico]

Does anything here help?
https://appletoolbox.com/airprint-not-working-fix-for-no-airprint-printers-found-on-ipad-ipod-iphone/