Where do I mail my Pa amended form

Print out both your PA 40 and your amended return and mail to one of the following addresses depending on if you owe or are getting a refund: 

• PA Dept Of Revenue, Payment Enclosed, 1 Revenue Place, Harrisburg PA 17129-0001 (payment), 
• PA Dept Of Revenue, No Payment Or No Refund, 2 Revenue Place, Harrisburg PA 17129-0002 (no payment or refund), 
• PA Dept Of Revenue, Refund Or Credit Requested, 3 Revenue Place, Harrisburg PA 17129-0003 (refund

https://www.efile.com/how-to-amend-pennsylvania-state-income-tax-return-form/

You would mail the 1040x and all documents used to prepare that return to:

https://www.irs.gov/filing/pennsylvania-where-to-file-addresses-for-taxpayers-and-tax-professionals

OP is filing an amended State return, not a 1040X

You would mail the 1040x and all documents used to prepare that return to:

https://www.irs.gov/filing/pennsylvania-where-to-file-addresses-for-taxpayers-and-tax-professionals

I wasn’t able to access my state return

i need to edit  . Also there is credits I wasn’t able to apply 

If you have already filed your state tax return then you need to wait until the return is processed in order to make changes to your return.  

If you haven't already filed your return finish going through guided tax preparation and when you get to the end you will be prompted to review your state return.  You can make any changes then.