404 error fixes.

I have a store for my Facebook group. youwine someyouboozesome.com. I am a POD new designer. I had Alieexpress products which i removed. Upon do so i made some errors within the product template. My members and customers are viewing a 404 error. I tried to do a redirect within the navigation settings. Nothing seems to work or i am doing this incorrectly. Your honesty is also imperative and appreciative.