Withdrawals to trusted addresses do not require two-factor authentication, even if it is enabled for your account.
The main use of trusted addresses is automated withdrawals with our Transfers API, but you can also use them for fast withdrawals from the web interface.
All your current trusted addresses are listed on the Security page on your Xena account.
To add a new trusted address, specify the cryptocurrency and the address:
You will be asked for your 2FA code to proceed.
Deleting a trusted address is also straightforward — just click on the "Delete" button next to the desired address.