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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Please make sure you're in the Form Builder. The Save button is located at the top left side, it is below the Form Title and beside the Preview button.
Please check this screenshot, I put a red box and arrow on the Save button location:
I hope this helps. Let us know if you need further assistance, we'll be happy to help you. Thank you.