RJ, Pretty easy posting, if you are a 1st class member. Just click on the top reply, not the quick one, you will see a icon of a mountain with a sun, click on that and your 1st class photos you uploaded will appear, just click on the one you want and it sticks right on! If not a first class member, you have to upload them someplace, then copy the url and past it in between:
The reply at the top of a topic you can attach small pix from your desktop that you have sized down to 600 pixels.