It seems lost in this conversation, here is my question.

I understand how to link a real bank to Quickbooks. But when I attempt to link my QB checking (which is Green Dot, I get that) I don't have a username and password for Green Dot. I opened the account THROUGH QUICKBOOKS. 

My QB use/pw doesn't work, my Green Dot checking account # combined with my QB pw doesn't work. 

What is the procedure for linking my QB account to my QB checking account when the QB Green Dot checking account doesn't have a user pw?

I've got you covered, Ferg1. I'll add details regarding the QuickBooks checking account with QuickBooks Online(QBO).

QuickBooks checking is already synced with your online account and has no separate login credentials. That's why linking it to QBO is unavailable. Is there a specific transaction you wanted to do with your checking account?

If you want to transfer a fund from your account to an external bank, check out this article: Transfer funds instantly with QuickBooks Checking.

To help you get answers to frequently asked questions about QuickBooks Checking, refer to this resource: QuickBooks Checking FAQ.

Let us know in the comments if you have further questions about managing your QuickBooks checking account. We're always here to help you out. Stay safe!