1. Below the subject line to the right you will see what looks like a picture frame that is next to the envelope. Click on that and it will open up a box where you can put an image URL or link to the picture. Copy the link to your picture and paste it there and leave the Alt text box empty then click insert image.
2. At the very end of the same line that the envelope is on there is a box that is 2 colors of blue. Click on that and you are able to download a picture from your computer. Then copy the link that it creates and then paste it into your post.