I clicked on "sign up" of the LITE (always free) business email option. It says you must own a domain to proceed email hosting, and I do have it and that is the reason I am here to host mydomain.com email accounts ( to start with 3 free accounts of my company domain.)

now it asks to create an account with zoho.com, I created. It asks my company domain name that I want to host and later on verify it, I did. Sounds reasonable. 

Now after Organization details is created I have been asked to create a admin email account, I gave myname@mydomain.com, and later it asked me if I wish to add more users for this domain , I did. 

now I set my mx records as well.

now the big question is, how do my users that I have created by username@mydomain.com will login to their respective email accounts ?? I can login to my account as I have registered with zoho.com and I am able to login to my account and receive my emails on myname@mydomain.com. But how did my users that I created with username@mydomain.com will login to their mail accounts ? cant able to figure that out.