Links to larger versions - Question

I've joined Digital Image Cafe in order to post larger versions of the images I post here. I would like to make the larger version accessible from a post here. I've noticed many people have a blue lettered Larger Version on the page. How is this done? (In layman's language please)

The Text Style Menu shows you how. A link can be found just under the smilies in the "Reply to This Topic" section.

Thanks guys. IMO, this is one of the greatest aspects of NPN! Regardless of what questions I ask, someone ALWAYS seems to have an answer!