When setting up your profile, you will be able to add links to your Social Network accounts. Here is some instruction on where to find your Twitter Username:

Desktop or laptop view

      1- Go to Twitter.com and log in to your account.

      2- Once logged in, you will see your Username and handle at the bottom-left corner. The text after the @ symbol is your name. 

Learn where in your Profile to put your Twitter Username or Handle by clicking here.