Before you can use HosPortal to send invoices you need to set up your invoicing and billing details. If you do not have any billing details entered then you will not be able to use the invoicing functions.
All your facilities will use the same billing details. It is not possible to have different billing details for different sites.
To create and edit your billing details
Click on your name at the top right of the screen and select 'Account settings' (A)
Go to your Billing details (B)
Click Edit (C) to enter the details to appear on your invoice and select save when complete.