With the Default form, you can give your users the option to proceed as guests or to register an account while they request a price estimate.
In the Form Settings tab, you will find two options about enabling registration on the Request a Quote page.
Check only The plugin adds a checkbox below the form, if you want to give your users the possibility to register an account or to proceed as guests. They will be able to check an option at the end of the form Create an account? and to create a password for their account.
Check also Force registration on the “Request a Quote” page if you want your users to proceed only with an account, and never as guests. They will be forced to create a password for their new account.