|Generally you'd connect the camera to the computer with the USB cable provided for that purpose. The camera's SD card should show as a drive in 'my computer' and you can copy the files over to a folder on your computer. Then you can email them, usually as an attachment, to your teacher.|
Or you can remove the sd card from the camera and use a card reader attached to the computer to copy the pictures to the computer.
Often software comes with the camera that can be installed on your computer. If you have that installed on yours and are familiar with its use you can copy the pictures using the canon software.