Band Pencil automatically generates an invoice for your event, but you have full control over its contents.
If you want to set or change the invoice image, you'll need to upload your logo to your files within Band Pencil first. You can learn how to do that here. Once you've done that, follow these steps:
To update the invoice or purchase order number, notes or status follow steps 1 and 2, but this time update the desired fields.
You can also set a default logo for invoices from your account settings.