Has selling on Amazon changed significantly? Having a difficult time figuring out the process.

I’ve only sold a few things. I remember when browsing the site, if you were viewing a product, there’d be an option for “sell yours here” and you could list your item, and just ship it to amazon and when someone bought it they’d send it off.

I have a couple security cameras I bought but the ones I already had, when I changed internet providers, no longer worked so these just never came out of the package, so I figured I’d just re-sell them. I don’t see that ‘sell yours here’ option anymore and not sure how to go about it.