I only knew how to do this today, after all these while I had been using it. I guess it’s not very often that one had to change their username of their account. Here are the steps for Twitter (Web), at least that was how I did it.
- Click on the “More” button found at the left hand navigation menu
- Go to “Settings and privacy”
- Under “Your account” section, go to “Account information”
- You might need to re-enter your password at this point
- Under the “username” section, edit and change the username of your choice
Your twitter link will follow this new username too. It is that simple.