Depositing Stellar Lumen (XLM) to Bitfinex requires both a deposit Address and a deposit Memo.
To make a Stellar Lumen deposit, you need to use both:
On the deposit page, the deposit address is shown at the top, with the deposit memo for each of your wallets shown below. To make a deposit to your Exchange wallet, for example, you will need to use the deposit address shown near the top and the deposit memo next to your Exchange wallet.
Please note: If you fail to include the deposit memo with your deposit your XLM will be lost forever.
Some Stellar wallets need to be activated before funds can be sent to them, please ensure that your wallet is activated before sending funds from Bitfinex otherwise your withdrawal will fail. You can find out more in your wallet's FAQ/information and by checking the address exists in an explorer.
Please contact support if you have any questions or concerns.