Dx6i manuals suck at explaining the bind.  Dx6 manuals were better.  I'm going from memory on this.  I'd recommend this...

Unplug the BR completely.  Turn off the Tx.  Plug the bind plug into the battery slot.  Take a 4.8v. battery pack and plug it into any remaining slot.  You should have a blinking light now.  Hold the bind switch on the Dx6i as explained in the manual (I think its the trainer switch), and turn it on.  You should get a solid light in about 5 seconds.  Unplug the battery, and the bind plug, and then install.