New user registration email content modification for Profile Builder Plugin

Hi all,
I am totally new to wordpress. In one of my project I am using profile builder plugin & I want to customize the email content which is sent to the new users after registration. I have tried every possible way but unsuccessful. So anyone plz help me out. The registration file can be found in
wp-content/plugins/profile-builder/front-end/wppb.register.php

I tried to customize but I cant…Inside wppb.register.php in line 510 mail function can be found.

Please help me out…

thanks:)