how to switch between email accounts

how to switch between email accounts

I have several email accounts with zoho (the main one being admin@my_domain_here), and every time when I would access zoho mail at mail.zoho.com, it is the admin account by default.

How can I switch between email accounts and access other non-primary accounts with zoho's interface ? 

this should be a trivial question, but I am having no luck in figuring out a way.
Many thanks in advance.