Aaa, I feel really stupid for asking this, I should know how to, but what ever I try it doesn't work. Mind you I'm new to OS X. Anyway, how can I post a photo on Macrumors? There asked it, you all have permission to make fun of me.
BTW, if you want a large image to act as it does below, replace the IMG and /IMG tags to TIMG and /TIMG
I recommend downloading QuickshareIt, and getting a URL for your file from that. Then press the 'Insert Image' button while writing your post and paste the URL...