How to prefill some data on the form?

We like to fill in some details for our customers. Are staff in the office able to do this? Also, is it possible to edit a form once it has been completed. For example a customer changes their mind, can we make changes to the form and resend out for signature? 

Thanks 

Hello,

Please find your answers below:

"We like to fill in some details for our customers. Are staff in the office able to do this?"

If you want to have pre-defined fields, you can set values to fields in the form builder. As I have checked your form named "Clone of Training Application Form", I have seen that you already have a pre-defined text area.

" Is it possible to edit a form once it has been completed?"

Yes, it is possible. You need to set an edit link to the autoresponder email as you can find in the following document: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date 

"For example a customer changes their mind, can we make changes to the form and resend out for signature? "

This is a totally different case from the previous one. If a customer changes their mind, why do you want to change the form? If a customer changes mind, she or he can edit the submission.

If you delete a field from a form after submission completed, you will lose that data forever.

If you need further clarification, let us know.

Thanks.