When 2FA is enabled by email you will have an additional backup code to your email to log in to your account and withdraw funds.
To enable 2FA by email you need to go to your Personal Cabinet:
Settings → Security → Account security → Email
Next, you need to send a backup code to the email used during registration:
Enter the code received in the email and click "Enable":
After entering the backup code received by email, you will get 2FA connected with sending codes to email when entering your account, withdrawing funds.
You may optionally disable 2FA for entry or withdrawal and leave additional protection as 2FA with sending codes to email only for one operation.