The Save & Return feature allows users to create accounts that are associated with their form results. A user can use their account to save a partial result and return later to finish, or to view past results.
To enable Save & Return, you can either add a Save & Return item from the Common Items category or enable Save & Return on your form's "Form Settings->Save & Return" page. You can allow users to create their own accounts or manually add accounts by clicking the "Simple Add" tab in the accounts area. Each account must have a username and password—email is optional. The "Bulk Add" tab allows you to create a large number of accounts in CSV format.
If needed, you can link or unlink existing results to/from a login account on your form's Results Table. Click in a result row's "Username" column and select the appropriate account username.