how can i save customer data

i need to save the customer data so that they didnt have to enter this data everytime

You can generate a prepopulated URL to give to your individual users which they can use every time they fill out the same form.

Prepopulating-Fields-to-Your-JotForm-via-URL-Parameters

How-to-Pre-Populate-the-Same-Form-with-Data-from-a-Previous-Submission

If this does not work for you, kindly share to us the form URL, the fields that needs to be prepopulated and your process workflow.

Where-to-Find-My-Form-URL