Blynk local server send mail welcome message body

Hello, I installed blynk server on my vps server. works smoothly. A mail is sent when you subscribe from the andorid application. welcome he happy blynk. i want to change this

Auth Token: ------------

Happy Blynking!

Getting Started Guide ->
Documentation ->
Sketch generator ->

Latest Blynk library ->
Latest Blynk server ->

How can I change this mail? This message comes when you become a new member. when I sign up and want tokens. The message body in the name is coming.
Where can I change the mail sent when I first become a member?