Jeff..., take a look at the excellent tutorial kingsburryarms posted. A link can be found at the top of the page, under the "search" window...
When you reply to a post, or open a new topic, under the box where you type what you'd like to say is a "add image to post". Tap that and it links you to imgbb.com. It'll open in a new window with a message "select the images to upload". Tap that and you can then choose photos from your photo album, which will then be uploaded and linked to ALR. Hope that helps and makes sense!
Many thanks,
Ed