This is an odd little item that throws people for a loop sometimes because by default, InDesign doesn't come enabled to do the Bridge Workflow. You have to install the plugins from an InCopy disc to get this to work and dragging and dropping the plugins won't work. I tried that a couple of times and it seems like something actually needs to be installed for it all to hum along nicely.
So, on a machine that has InDesign installed (with the application closed), stick in the InCopy disc. Go through the normal steps of installation for InCopy, but right after you input the serial number, you should come to a screen that has the type of installation you want to perform in the upper lefthand corner as a dropdown menu. You want to choose the last option which installs just the plugins for InDesign and doesn't install InCopy. Once you've selected that, start the installation and watch it go. It should be very fast and once it's done, you can start up InDesign, go in and set the User under the File menu. This can be anything you want, as it's just for the check in/check out process and not related to anything license oriented.