Hi there, @terry-astar.
If the account itself is missing on the Banking page, it may be disconnected. You may need to connect the account to bring in your transactions.
Connecting this account from your chart of accounts won't work if you're using a credit card. If this is a bank account, you can perform the following steps:
You may check this article that contains a video on how to connect your credit cards: Connect bank and credit card accounts to QuickBooks Online.
However, if this isn't what you mean, do let me know. Any additional details or perhaps a screenshot of the issue is greatly appreciated.