Bitfinex Securities is only available to Full Verified account holders from non-prohibited jurisdictions who have successfully created a Bitfinex Securities account.
You can learn more about the verification at Bitfinex here: Verification Levels and Advantages.
After you've opened your account, you'll need to fund it before you can start trading.
How to transfer funds from the Bitfinex account to the Bitfinex Securities account
To transfer funds from the Bitfinex to your Bitfinex Securities Account and vice versa without incurring any costs, you can use the Quick Transfer widget.
You can select the associated Bitfinex account you'd like to transfer funds to in the Account section:
Also, you can use the standard Bitfinex deposit options to put funds directly into your Bitfinex Securities account. Please, take a look at the related articles below:
Similar to the withdrawals:
If you have any questions about how to transfer funds to your Bitfinex Securities account, feel free to contact Bitfinex Support.