To make an online bank transfer, you must have a bank account in your name with online banking features enabled.
If you don't have that, we advise that you reach out to one of your local banks and inquire about these options.
When you have it, you simply open the "online bank transfer" option on the corresponding betting site, after which you will be transferred to a payment portal.
From here, you will enter your bank account details and the money will be deducted from your account and instantly available in your betting account.
Click here to learn what betting sites accept online banking deposits