You can't retract feedback, and you haven't left any feedback that is eligible for you to revise it. Only negative and neutral feedback within the last 30 days can be revised. You have only left positive feedback.
I read your other post about this, and the email you show in your screenshot is not a revision request. It's a reminder to leave feedback, and you have now left positive feedback for that purchase.
If you're talking about a product review, you have only left one, and it was positive. Is that what you want to retract? Here's a link to your review page. If there's a way to edit or delete your review, it should be there.
https://www.ebay.com/urw/sasquatch135
If you can't find it, here's the help page about product reviews. There's a link here to report an inappropriate review. You can try reporting it, and say that you wrote it and you want it to be removed because you changed your mind.
https://www.ebay.com/help/selling/listings/product-reviews?id=5186
