Hey man So. To post an image, it asks you for a URL. So in that case, you're probably thinking, if your image is saved on your hard drive, "what do I do?" Well first, you must go to I.imgur.com, and create an account. Then, click upload image from your computer. You then click the image you'd like to post, and upload it. Once it's done, click on it. There should be a series of URLs that contain the picture. Copy the default one. Then, go back to your post here, and click on the small image icon in the toolbar above your post box. Then, paste the URL
And click Ok or go, whatever it says. Your image should be there Hope I helped!