How to I upload previously created form to Jotform?

how to I upload previously created form to Jotform

How did you create your form? Is it a web form? If so, you can try to clone it:

How to Clone an Embedded Form from a Webpage

If you have a form created in Word or Excel, is not possible to import it to JotForm. 

If you have Adobe PDF, you can import it:

https://www.jotform.com/fillable-pdf-form-creator/ 

If you are unable to import/clone your form, I can only suggest you to create a new form using our Form Builder:

How to Create Your First Web Form

You can also check our Template Gallery.

How to Use Form Templates