Unfortunately that template was ported to Serendipity before the version 1.1 theme configurator was even a gleam in Garvin's eye, so you're going to have to get your hands dirty I'm afraid.
What you need to do is edit the index.tpl file which is found in the templates/connections folder.
About a dozen lines down is where you'll find those links. Replace the # with the full url of the link you want.
