First I will assume that you have down loaded your coins image as a jpeg file. You will see in the reply post above Fee image optimizer, you can click on that and it will help you move your image from your download into a size that conforms to the forum. once it is within size, you click on the error and it will be downloaded to your computer. You will go back to choose the file, (choose the new jpeg that was optimized and then choose to upload to your post. Once you have uploaded your pictures (obverse and reverse and any close up's) you will click on preview post. You will see what you have written and the pictures you are posting. If they are wrong or miss oriented, you can delete them and try again. When you are satisfied, hit post.