From CA:
go ingame, press PRTSC (top right of your keyboard.
the screenie shows up in your CA folder. go to TinyPic - Free Image Hosting, Photo Sharing & Video Hosting and upload that picture.
then copy the [IMG] code where you want the screenshot.
From Your Desktop (Not in CA):
Press PRTSC
go to MS Paint, hit CTRL+V
save the picture. then upload that to TinyPic - Free Image Hosting, Photo Sharing & Video Hosting, and copy the [IMG] code into where you want the pic to be.