Add to Registration E-Mail Text

I was looking to add some additional text to the email that users receive when they register or pre-register a swimmer. Is there a way to do this? I didn’t see anywhere to change it on the wp dashboard, besides choosing between html and plain text formatting. I also looked through the plugin files but could not find where the email was generating text.

Thanks

https://www.ads-software.com/plugins/wp-swimteam/