Maybe a screenshot of the Task Manager?
Alt PrtSc copies the current window to the Clipboard
Open Paint
Paste
Save with appropriate name for you - Note the folder it goes to because you will need that later
Use Image Button to add image to post - You have to "Upload" it - Interface is not that great but it works.
Image button shown Large and Normal.
Browse your device
Find image file you saved earlier
Open it
Once it has loaded (can be a while for big images) Press Upload
Yes a lot of steps - hopefully it's worth it. Some forums I read simply allow images to be Pasted from the clipboard. Many fewer steps, 2 vs 9.