no trackback option (to give url to others) shows up on published post

Wow, I figured out how to trackback to someone else’s blog! So I’m looking at my site and can’t see anything that would give the trackback url to others who want to trackback to my blog. I’ve searched through all the options and have allowed trackbacks. Is this to do with my chosen theme? How can I add this in? (btw The comments submission form shows up fine.)