How do I change my user name?

I  would like to change my username from belashoaib to siaht and I can't do that I have tried to change, I was able to change my name but not my username

Since the username (siaht) is available, I have now changed your username from (belashoaib) to (siaht). Please note that now that the username has been changed, if you have set custom URLs of your forms, those custom URLs will not work anymore. So, you should re-create custom URLs of your forms. Please refer to this guide: How to Create a Custom URL of a Form?

However, if you have other questions or concerns, please don't hesitate to contact us again.
Regards.