In order to take in-game screen shots, you have the following options:

1) Use the “screen shot” icon in the upper right corner

2) Use the screen shot shortcut keys

+ = make a screenshot.

+ + = make a hires screenshot.

+ + = make a screenshot on green background.

All screen shots are saved to your hard disk in PNG format → How to find my screenshot folder?

The screenshots can also be viewed and even edited in the menu called “Media”.