Now that you have a sub account setup, there's a distinct possibility this person will need to access the Member Portal. In order to give them access to the Member Portal
One main difference between a Primary Account and a Sub Account is the fact that Primary Accounts login using their email address and a password. Sub Accounts login using a username and a password.
To setup a Sub Account's username and pin, simply navigate to the Edit Person page for the Sub Account and enter the information here.
As with any account, you can simply set the username here and then click on the "Send Account Setup/Update Link" link on the right rail of the page.
Note: The username cannot be the email address of the Primary Account.