I purchased Quickbooks online and can not move from desktop. I have discovered desktop is registered under another email and can't connect the two. How to fix this?

Do you wish to migrate data from QB Desktop US to QBO US, or else?

It's nice to see you here posting in the Community forum, @meggarsmom.

Having a different email address on QuickBooks Desktop (QBDT) and QuickBooks Online (QBO) is not a problem as long as upon conversion, you'll be entering your QBO credentials. 

To import your QBDT company file to QBO, here's what you'll need to do:

1. Get your desktop file ready like making sure that QuickBooks is up-to-date and checking the company file if it isn't too big to export.
2. Import your desktop file to QBO. 
3. Make sure your books match.

For more detailed steps about this process, take a look at these articles:

• Move your QuickBooks Desktop file to QuickBooks Online
• What to do after converting from QuickBooks Desktop for Windows or Mac to QuickBooks Online
• The QuickBooks Guide to Converting QuickBooks Desktop to QuickBooks Online

I'll be right here to help if you have follow up questions when converting, just leave a comment below. Have a great day!