How do I make a claim to get a waive of fines?

As a nonresident, I must file 1040nr, but I filed it as 1040. I amended it by filing 1040X of my own accord, but I got a penalty of $450. In order to be waived from tax on these penalty, what words or phrase should I use to write waive letter? 

 

I look forward your helps.

 

Thank you so much in advance.