Change Username

I would like to change my Jotform username - could you please advise how to do this?

Please let us know what your desired username is, we will be glad to change it for you. Also, provide alternate usernames in case the proposed one is not available. Please note that custom URLs will not longer work once the username is changed, so if you have any, you will have to create it again: https://www.jotform.com/help/261-How-to-Create-a-Custom-URL-of-a-Form