How do I make & remove offers on an NFT?

You can make (and remove) offers on any NFTs on Sparkles.

When making an offer, you will notice that you have to use Wrapped Songbird (WSGB).

If you haven't used WSGB on Sparkles before, you may be prompted to approve Sparkles to use WSGB in association with your profile (this is safe and you can see why here), along with a one-off gas fee.