To initiate a Citibank wire transfer, log in to your Citibank online account. Navigate to the "Payments & Transfers" section and select "Wire Transfers." Enter the recipient's details, including their bank name, account number, and SWIFT/BIC code. Specify the amount and currency for the transfer. Review all the entered information for accuracy, as wire transfers cannot be reversed. Confirm the transaction and, if prompted, enter your secure PIN or verification code. Citibank typically charges a fee for wire transfers, which will be displayed before you complete the transaction.