Once you are happy with the invoice you can now trigger it to be emailed from Xero. Under actions select "Email Invoice to customer". This action will send the invoice directly from Xero and mark it as sent (which is handy for accounts as they will also know that it's been sent out).
You will not be able to email the invoice if:
- Payment has already been received
- There is no primary email address assigned to the Xero contact
Once the invoice has been emailed you will no longer be able to edit it - you will have to contact your Xero administrator to make any further changes. This is so they can ensure tax payments fall into the correct time periods.