Does anyone know how I can connect with ADP?

Hello there, @root6.

Welcome aboard to the QuickBooks Community. I’m here to share some information about connecting QuickBooks Online (QBO) with ADP.

The connection method for outside payroll services depends on the third-party application used. For external payroll information, you may enter your data manually via a journal entry.

Here’s how to create a Journal Entry in QuickBooks:
1.    Go to the Plus (+) icon and select Journal Entry.
2.    In the Journal date field, enter the transaction date.
3.    Fill out the information needed.
4.    Once done, hit Save.

I've attached screenshots for your reference.

For more details on which accounts to debit or credit, please see Record payroll transactions manually article for your guide. 

You may also check out some supported 3rd party apps available that would help in importing data. Just head to the QuickBooks App Center and search for a keyword like Import Payroll transactions to get started. 

That's it. Please know you can always reach me here should you need any help with QuickBooks. I want to ensure your success. Thanks for coming to the Community and take care.