I was going to post a couple of pictures of the streamliner I’m building but I’m obviously too dense to figure out how to stick photos up, advice from those who know would be greatly appreciated. 
I am not computer literate and had the same problem. Eventually I found out by clicking on FAQ at the top menu, then under Search, key in “Post Image” and there it explains how to do it. I still don’t know how to make them come out a reasonable size. Mine are always huge.