Got it. Hopefully I won't have any problem this year. Thanks!

OK. Thanks for the helpful links. Now I understand what AGI is. I have no problem to send e-file. I sent e-file last year too. But IRS later send the file back ...

Thanks for your response. Where can Ienter AGI or PIN? I'm on the step that ask me to chose payment option already. So far I was't asked to enter AGI or PIN. By...