You can use any screenshot tool. If you don't already have one you prefer, we recommend Lightshot (https://app.prntscr.com):

• Windows, Mac, and Chromebook (Lightshot Chrome extension).
  
• Captures any portion of the screen.
  
• Allows you to mark it up before saving.
  
• Allows you to save to any folder with any name.
  
• Allows you to easily upload and share via a link.
  

Windows users may also use the Windows Snipping Tool:

Windows Snipping Tool

Mac users may use the Mac Screen Grab tool:

Mac Screen Grab