How do I upgrade my Amazon Seller account from Individual to Pro?

How do I upgrade my Amazon Seller account from Individual to Pro?

This is done on Amazon Seller Central following these steps: 

1. Locate and click on the Settings button on the top right-hand corner of the main Seller Central page
2. Click on Account Info 
3. Locate the section on the left-hand side that says Your Services click on Manage 
4. In the section that says Sell on Amazon locate where it says "Click to upgrade to learn the benefits of becoming a Professional" under the market place you wish to sell in with a Pro account ( for example, Amazon.com) 
5. Complete the interview process online following the steps providing all the necessary information for your application to be approved.