Changing the drop-down name of meeting room

We have two zoom accounts.  

When my tech assistant set them up, he confused the names and of the two rooms in the drop down menu, which includes "Myself" and then the names of our Zoom rooms.  So signing into our main account, the drop down menu shows the other account's name, and vise-versa.  

Neither he nor I could see how to change that name in the drop-down menu.  Can you tell me how I would do that?