Sellics allows you to respond directly to questions on Amazon. When you click for the first time on the "Open on Amazon" button, you will be redirected to the question on Amazon, where you can type in your answer.
Reminder: It is a very common mistake to log in with your individual Amazon login rather than the brand. This will not allow you to reply with the "Manufacturer" badge. If you accidentally make this mistake, please review your login information and log in with your brand's credentials. You can find more info on official comments and replies on Amazon at the link here.
For complete guide, visit The Complete Guide to Reviews & Questions.