It's definitely been quite hot down here!
Anyway, to help you out, when you reply to a topic, click the 'Go Advanced' button at the bottom of the 'Quick Reply' box, which will take you to the same page you'll see when you create a new thread.
Along the toolbar, you'll see a button that when you hover over it, says something to the effect of 'Add a Picture'. Click that, and it will ask for a link to a picture.
When you want to post a picture on this site, you must upload it to a host site. I personally use
Image hosting, free photo sharing & video sharing at Photobucket . You register, and from there, you're able to upload photos to the website. When you do so, you will see that each individual picture possesses its own unique web address. Copy this web address and go back to your thread/reply and paste the entire web address into the box. Press 'Ok' and you'll only see a bunch of text in the box, but when you submit your thread/reply, the picture will be there.
It might take a while to get into the habit of doing this, so just know that the 'Preview' button is your friend and will help greatly with setting up a thread or response with pictures prior to actually posting it.
Hope this helps.