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

This is done on Amazon Seller Central following these steps: 

Locate and click on the Settings button on the top right-hand corner of the main Seller Central page
Click on Account Info 
Locate the section on the left-hand side that says Your Services click on Manage 
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 
Complete the interview process online following the steps providing all the necessary information for your application to be approved. 

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