i think they mean crop a noisy part of the photo but don't resize it. Just make sure it's smaller than 801 pixels to adhere to the forum rules.
I see two shots in your gallery but they're far too small to see the noise. Open the original in your editing app and then use the crop tool to select a small section where you think the nosie is. Save the cropped part as a new file and upload it here. Then it should be easier to see what's happening.