Hello there, jazwag76,

If you already have a Bill.com account, you'll have to set up the bill.com application in your QBO account to integrate its data. Here's how to do it:

1. On the left menu, click Apps.
2. Choose the Find Apps tab.
3. On the search field, enter bill.com and click the result.
   
4. On the top right of your screen, click the Get Bill.com. tab.
   
5. Click Connect.
   
6. Enter your login credentials and continue the prompts.

You'll want to check the comparison: Comparison between Bill.com app and Online Bill Pay.

If you wan to move to Online Bill Pay, check this articles: Move from a Bill.com account to Online Bill Pay.

Let me know if you have other questions.