Rsform custom form

I want to build a form with Rsform pro. The user must login to be able to fill the form. At the bottom of the form must be a SAVE button instead of submit button. After the user fills the form and clicks on the save button the submission will be saved in the database but the data he filled will still stay in the form User can make changes in to the data he filled, click on save button again and the new data will be displayed in the form. Anytime the user login to the website and click on the form his previous submission will be preloaded in the form and he can edit the items and save again.