Note: For W-2's before 2020, you will need to sign into www.gusto.com
You can find your W-2 when you log in to your ADP account:
Log into ADP here
On the top navigation bar in ADP click "MYSELF"
Click "Pay Statements"
On the bottom left part of the page you should see "Tax Statements"
Click the download icon next to your W-2, and you're all set!