This short tutorial is just to explain the methods available for taking screenshots in Football Manager.
There are 3 different methods to take screenshots on FM.
The first method is the simplest and most universal. Print Screen button!
Press this button and then open an image editing program (eg. Photoshop) and then paste the image into it.
The second method, is available through the Steam Client.
Press F12 and then go to View -> Screenshots.
Also it is possible to take screenshots when you press ALT + F9 within the Football Manager.
The images will go to -> Documents\Sports Interactive\Football Manager 201*\screenshots
Then just upload the image to an image hosting site and grab the link for forums.