there’s a link “add image” right below the comment box (the space you type your posting).
i dont know if it allows files other than image files (gif, png, jpg, etc). so what you’ll want to do is either create the graph as an image directly in the graphing program or take a screenshot of the graph (use the Prnt Screen button, open Paint, paste into a new picture, save the picture as type .jpg).
once you have your image created and saved on your computer, click the add image link, upload the file and proceed as directed.
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