It's good to see you here in the Community, Jason.
It seems that you're trying to add another user to your Chase credit card account. I'd like to redirect you to the bank support team to address this concern.
While there isn't a way to do this in QuickBooks, I recommend contacting your bank support team. This way, they can provide further information and help you add another user to your bank account.
You may want to reconcile your bank account in QuickBooks Online. This will help make sure your QuickBooks transaction matches your bank statement.
Come back to this post if you have other concerns with QuickBooks or follow-up questions. I'll be around to help.