CryptoTrader.Tax only needs "Read" or "View" access to import your trade history. This permission protects your accounts. Learn more about API access in this article here.
Login to your FTX account.
Click the setting icon in the top right corner.
Select API from the menu on the left.
Click Create Read-Only API Key.
Write down your API secret, as it will not be shown after closing the dialog.
Navigate to the FTX tab inside CryptoTrader.Tax and click Auto-Import, enter your API Key and API Secret into the provided text box.
Finally, click Sync Transactions to import your transaction history.