You can bid on specific NFTs or on entire collections.
Placing a “floor bid” on a collection will let any owner of any NFT in the selected collection accept it. If you bid on an individual item, only that NFT's owner can accept it.
By placing a floor bid, you might get any NFT from the collection, but the chance is greater that your bid will be accepted. By bidding on an individual item, only one person can accept your bid, but you'll only get the item you chose.
Bidding at your own price:
1. Go to the explore page and find the NFT or collection you'd like to bid on.
2a. To place a floor bid on a collection, navigate to the collection and click "Place floor bid". A reminder: This enables any owner of any NFT in the collection to accept your bid.
2b. To bid on an individual item, click on your favorite NFT and click on the three dots on the bottom right-hand side of the NFT. Then click "New bid."
3. Enter your desired bidding price and expiration date. Then, click on "Place bid."
4. Sign the transactions in your wallet. The first transaction requires you to convert some ETH to WETH, the second approves Rarible to place the bid using your WETH, the third places the bid.
5. Your bid offer has been placed. Now you can wait until it's accepted!
Note: You can find the NFTs that you have bid on under your activity.
If you wish to change your bidding price or cancel your bid offer, follow this article: How to manage your bid offers