As a sidenote - I've seen other people ask this question, and they got a lot of not-very-helpful responses, apparently a lot of people don't understand the question. If anyone can provide step-by-step instructions on how to do this, I would be grateful.
Thank you so much for your time. Each Selling Account has associated with it a Buying Account. In order to leave comments on Product Reviews you will need to be in the Buying Account of your Selling Account. Please note that if the E-mail you used to create your Selling Account is the same as your personal buying account, your personal buying account is the Buying Account associated with your Selling Account.
I apologize but it is not possible to change the Buying Account associated with your Selling Account, however you can update your information so that when you leave comments on Product Reviews it is clear that this a response from your business.
Thank you so much for your understanding. If you have any additional questions or concerns please reach out again. I hope you have a lovely day.