First advice is to upgrade. GnomeSword is now "Xiphos", and is much, much improved over the version you have. I can't guarantee that anything will work or that I will give you correct advice for a version that old. Please see http://xiphos.org/download/debian-ubuntu/ for instructions on upgrading.

The url format (assuming it actually works in that old version) is like this:
sword://KJV/Genesis 1:1
notice that KJV has to be exactly the name of the module.