Question: How do I change the starting invoice number?
Answer: Click on Profile (in the top black navigation bar) then click on Edit Options (top left corner). You will see an Invoice section and a place to change the starting invoice number.
You can also manually change any invoice number. When you click Create Invoice, then select the customer, the next page has a system-generated invoice number at the top. Simply delete that invoice number and type in your own. Each number can only be used once.