No, frankly, it's not an Excel question. You simply want to take a screenshot of Excel, which has nothing to do with Excel and everything to do with 'how to take a screenshot and make it a jpg.'
My point of why ask here was simply that every board has their own rules for what is/isn't allowed. You could ask there and find out what they would prefer rather than going through all of this trouble and have them not accept it/remove the example or something.