Hello there, daveng,
I'd like to ask some clarifications about the fidelity rewards credit card. Is the transaction downloaded from your bank and you want to categorize it? If so, you don't need account details to categorize your income and expenses in QuickBooks Self-Employed.
You only need to select a specific category to track your entries as business or personal. Feel free to read through this article: Categories to see updated existing categories and new ones.
Also, would it be okay if you send a screenshot of the page where it's asking you to enter account details? Just click the Reply button and attach the file. This will help ensure I provide the right solution for you.
I'll keep this post while waiting for your response. Thank you and take care always!