I'd like to update my username to be "Development"

Thank you for contacting us. That username is not available. Please provide us 3 possible usernames in order of preference, and we will change it to the first one that is available.

Please note that the custom URL of your form will stop working once the username is changed, so you will have to create a new one: https://www.jotform.com/help/261-how-to-create-a-custom-url-of-a-form/