JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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It is possible to change your username. You just need to let us know 3 options by order of preference if it is available we can make the change for you.
But if you already have forms with custom urls, the previous custom urls will stop working, so you need to generate new ones.
We'll wait for more details to proceed.