When creating an invoice, you will be asked to select a 'Header' as below:
To set up your 'Header', go to "Settings" and then "Locations" and select your location.
Click on the three dots and select 'Edit' from the drop down list to edit your location:
In the section 'Letterhead' type your location details in a format that you wish for them to appear on the invoice (do note this also pulls onto your prescriptions):
Click 'Save'. Do this for all your locations.
Then when you are creating your invoice, you will be able to select your location from the 'Header' options:
Fill in the invoice details and click "Save invoice".
The location selected will appear in the 'From' section on your invoice like below: