Most computers are capable of taking a screenshot using the "Prtsc" button on your keyboard or by using a screenshot program that uploads the picture automatically.
If you choose to use the Prtsc button on your keyboard you may have to use Ctrl+Prtsc or FN+Prtsc
Open the picture using a program like paint making sure to block/remove any personal information such as:
Your full nameSave the screenshot
Your email address
Upload the screenshot to an image hosting site such as Imgur
In the case of Imgur click "New Post" at the top of the page:
Once uploaded click "Copy" (note this will not automatically embed the photo)
Use Ctrl+V or Right click and choose "paste" to paste the link in the space provided
Using a program
You can use a program such as Lightshot or Gyazo to select a section of your screen to take a screen shot.
NOTE: In Lightshot you are able to edit the photo right there on your screen whereas Gyazo will take a raw picture and may prevent you from removing your personal information.