At the top of the screen is a link to GBO Photo Album. Click that link. On the Album title page, click the link for GBO General Photo Album. At the top left of the images, click the upload pic icon. Fill in a Pic Title, then click the Browse button and find your pic on your machine. Highlight the image you want to post, then hit Enter. Then click the Submit button on the screen. This process will put your picture on the Graybeard server.
When you get back to the image list page, click your newly posted image. Then highlight the address in the address box at the top of your browser and hit Cntl+C to put the address in your clipboard. Go back to the post you are building that you want to insert the image into. Hit Enter. The bbcode for images does not appear to work so you will have to type some real html in. Type a less than sign followed by img src=" then hit Cntl+V and then type in " followed by a greater than sign followed by hitting Enter. (This is ugly to describe because the board software doesn't allow displaying the less thans and greater thans.) Then click the Preview button to see if you did it right. If it worked, finish your post. If not, go back and look at what you typed and fix the deviations from the above instructions. If you can't figure this out, I can email you instructions.