Once you have found an NFT you are interested in, you can make an offer for it. What you have to do is to select the option “Make Offer” on the item page. Afterward, you would have to select the currency you’d like to make the offer in. You can select currencies like WETH (equivalent to ETH), DAI, and USDC. If the NFT is a Polygon item, you can make an offer using Polygon ETH. Once you have selected a currency, you can enter the amount of your offer and select ‘Make Offer.’
To view a list of all the active offers you have made, you can select the ‘Offers’ tab in your profile.