Can I delete a w2 that is incorrect and don't know how?

If you have not already filed your return, yes. 

• Make sure you are logged into your account
• Click Federal on the left tab
• Click Wages and Income on the top tab
• Scroll down until you get to Wages & Salaries 
• Revisit the Wages and Salaries Section 

You will be able to delete the W-2 by click the trash can next to it. 

If you have already filed your return, you will not be able to make any changes until your return is processed. You can amend any changes once the IRS has accepted your return. If they reject your return, then you will have the opportunity to make any necessary corrections, add anything that was left off, and resubmit your return. The instructions to amend are below:

https://ttlc.intuit.com/replies/3288565