How can I change my user name?

Need to Edit my user name 

You can not change username from your end, but we can do it for you. Please provide us three options in order of preference, in case that some username is already taken.

Also please note that if you were using custom URL name of forms, they will be affected when username is changed. You will need to change them manually to match the new username.

How to Create a Custom URL of a Form?