Kukai Wallet is a secure and user-friendly wallet for storing and managing Tezos tokens. It is designed to be easy to use, allowing users to store and transfer their tokens with just a few clicks. To use the Kukai Wallet to make purchases on an auction, you will need to connect it to the marketplace of your choice. Depending on the marketplace, you may need to register for an account, verify your identity, and link your wallet to the marketplace. Once your wallet is connected, you can then use it to purchase items on the auction. It is important to note that you should always read the pinned message before making any purchases, as it contains important information about the security of the transaction.