XF 1.4 How can I change the content of email confirmation?

[Minecraftly]

Hello,

I want to include a giveaway link in the confirmation letter after an user sign up. How can I change that? Thanks.

 

[Jeremy]

Search the phrases for some of the email content and the relevant phrases will show up.

 

[Minecraftly]

I've tried every phrases with the term "email" on however I couldn't find it.

 

[Jeremy]

Search the actual content on the phrases for a portion of the phrase. This is found under Appearance in the right hand side bar. I used "Confirm your account" and got these two phrases:
user_email_confirmation_body_text
user_email_confirmation_body_html