1) Go to the users section on the panel
-> Picture: https://prnt.sc/1ib6jey
2) Put the email that the subuser will use.
-> Picture: https://prnt.sc/1ib787z
3) Tell the subuser to check their inbox for a registration email. Be sure to check the spam folder as well.
If you require any further assistance, please contact our support at: https://billing.sparkedhost.com/submitticket.php