When I added a second MBL, I changed the name of the new one locally, but there seems to be no way of changing the name when it appears on wd2go web site. I know that the new one appears to the right, so is not a major problem, but I would like the names to agree with my local network names.
Edit: After investigating more, this could be related to a bug. As The_Hunter recommends, you can try removing it from the device UI and then try again to register it.