how to I reopen my form

If you are asking how to open your form for editing inside our Form Builder, simply go to your My Forms page first:

https://www.jotform.com/myforms/

Click on a form you wish to edit, and click on Edit Form button that appears:

If on the other hand you are asking about how to re-enable a form that was previously disabled, please take a look at the following guide:

https://www.jotform.com/help/180-How-to-Enable-Disable-a-Form

Please let us know if you need any further assistance.