Registration using a second organization

I have a stream monitor that’s supported by one organization, so when I registered the monitor on MonitorMyWatershed I used that organization’s name under ‘Organization’. That was a year ago. I am now registering a second monitor, for a different organization. I would like that (second) organization be identified with the second monitor, but I don’t see a way to change what seems the default in any registration to the first organization. Work-arounds??