Go into the Suppliers window and click on the Create Supplier button:
A new pop-up window will open. Here you need to fill out suppliers' details and click on Save. These will be used later when creating purchase orders.
That's it - a new supplier has been added. To see the full details simply click on the supplier name which is highlighted in blue:
Inside you will be able to see all of the information you filled in when creating a supplier. All of the future purchase orders created for this supplier will appear here as well.
How to edit supplier details
Open a supplier by clicking on its name highlighted in blue;
Click on the Edit button:
A popup will appear where you can make the needed changes and once finished click on Save: