To print from your phone to your Canon printer, ensure both devices are connected to the same Wi-Fi network. On your smartphone, download and install the Canon PRINT Inkjet/SELPHY app. Open the app and select "Printer Registration" to add your Canon printer. Go through the given directions. Once registered, choose the document or photo you want to print within the app, customize print settings, and tap the print icon. Ensure your Canon printer is powered on and loaded with paper.