two accounts?

debhurn

I didn't use zotero for a while, forgot that I had originally joined with one username and email address, and rejoined with another username and email address. Strangely, Zotero seems to know 'we' are the same and my library/collection is available to both login identities. But I am getting confused and would like to consolidate the accounts. What do I do to cancel one of the usernames and passwords?