How to change/modify Feedback that I already left??

[jp4az]

I purchased an Item and left positive feedback.  60 days later the item failed.  I have messaged the seller twice on this matter, but no reply from them.   I would like to modify my original feedback, or provide an update to the original feedback.  How do I go about doing this?

Thank You

[wooden_flower]

You can leave a follow up comment, but you can not change positive feedback.  View your feedback left page - you should see a link for a follow up.