I have never used the online QBs, and have no idea how to post credit card purchases that would be expenses for the company.

Hi there, 

Recording your credit card expenses is simple in QuickBooks Online. I'm happy to hear you're making the most of the program and learning all the ins-and-outs for your bookkeeping needs. I'd be glad to explain how to record a credit card purchase in QBO. 

Follow these steps to record your credit card expense:

1. Click the + New icon.

2. Select Expense. 

3. Enter your Payee, Payment account, Payment date, and Payment method (credit card). 

4. Enter all other details.

5. Click Save and Close. 

Simple as that! 

If you have any other questions, please don't hesitate to reach out to our tech support team. 

Cheers.