How to change facebook user name many time

Today I will show you changing facebook user name many times 

What do you think ?? I will use any trick ?
Of course not , facebook has allowed you to change the user name repeatedly
Let's take a look at how to change name First,
go to the browser of any PC or your smartphone using default browser or Chrome browser,
log in with your Facebook ID. then go to this Link, and then choose your user name .
If a check mark will appear if the name is empty ..

Then save it........ Done ..
sorry for my bad English
Thank you