It has been forever since I uploaded to a board, and for the life of me cannot remember how to do it. I couldn't find anything using search either. Can someone please help?
If you're trying to use a picture that's already on the interwebs, then right-click on the picture and select, "Copy image URL"; paste it into your message; highlight it; and click the camera icon - 2nd row, 2nd from the left - to bracket it with the img /img tags. Or you can type those in as you get more comfortable.
If it's an image on your harddrive, I'd recommend uploading it to a 3rd party site (I prefer imgur.com, but you can use any of your choice) and then follow the steps above.