USER NEEDS MAILBOX.. PLEASE HELP

USER NEEDS MAILBOX.. PLEASE HELP



Currently, there is no mail box available for your account. Click the button below to send a request to your administrator.

This is the error  message the user I just added keeps receiving. How do I fix this as an administrator. Also if it helps I have the free account edition for up to 25 users because I am just testing out Zoho . Please help need to fix this as soon as possible.