Thanks @DebSheenD ,

I think that I am unable to see an option to "Manage Users" because every time that I log into QBO, I am automatically logged into the "Accountant" view rather than the account admin view.  I believe that both usernames and email addresses are identical.  

I did attempt to perform a permanent deletion of "my company" as a client from "my company's" list of clients (note that "my company's" only client is "my company" since "my company" does not do accounting and this was a mistake). Note that when attempting this, I am viewing the page from "my company's accountant" view and not from "my company's QBO" view. 

Does this make sense at all?  I feel like I am going round in circles, but the main point is that I am unable to login to "my company's" QBO account, because it always defaults to the "accountant" view.

Further