Press the Print Screen (or PrtScn) key on your keyboard to copy the entire screen to the clipboard. Now open a program like Microsoft Word or Paint. Create a new file, and paste it in the image from the clipboard. You can paste it either from the Menu –> Edit or use the keyboard shortcut, CTRL+V. Then save the file and send it to email@example.com.
Press Command-Shift-3 to create a picture.png file on your desktop. This .png file is a snapshot of your monitor. You can email the file to firstname.lastname@example.org