There are 2 ways to begin adding an order:
Go to Orders & Quotes > Orders then click [Create New Order]
In the Admin Area navigation pane, click on Orders & Quotes:
A sub navigation pane will slide out, click on Orders:
In the main action area, click the following:
You will see a pop-up window where you enter your customers email address and click
[Add Order]

Please Note: This should be your customers email address and not your own.
As this is an order between you and your customer. The system needs your customers email address in order to send them communication and for you to correctly identify the order in the future. .
The order will be created and you will be taken to said to order to edit.
So see: View / Edit an Order