First, you cannot create a bank account that shows in the left navigation pane. Only functional tabs show there.
Second, bank accounts will be summarized on the Summary page under a control account named Cash at bank. To see individual bank balances, you must drill down on that account’s blue balance on the Summary page or click into the Bank Accounts tab in the left navigation pane.
Bank accounts are not created in the Settings tab. They are created within the Bank Accounts tab. See https://www.manager.io/guides/11367.
As @Joe91 said, post screen shots. Upload them using the arrow above the forum composing pane.