It's not a link, it's either one of those white buttons with no text or icons on (slide your mouse over them and see what each one is for) or if you're in quick reply, you should see a line of icons, on mine, it's the 4th one from the right, looks like a picture frame. Good luck.
Edit: Just went and looked what it looks like when you start a new thread, that "picture frame" icon is in the middle row, look for the picture frame icon there.