To add a new Sell Document click on the Sell button in the header menu.
On the top right hand side of the screen you will see a green button which says "Add new Sell".
A small screen will appear.
You will be given three options: Quote, Invoice and Credit Note.
Choose the Document you wish to add and then click "ok".
A new screen will appear.
Fill in the relevant information under each heading.
To save this Document you have either to click "Save as Draft" or click "Save and Send".