I'm very confused about how to make a form and save it to complete filling it it out later.

https://www.jotform.com/help/26-Setting-up-an-Autoresponder-Email 

May you please help me with this? 

The Continue Forms Later option can be enabled in SETTINGS / Form Settings / Continue Forms Later option.

You can check this in your form using the Form Builder https://www.jotform.com/build/200124918761048/settings

Let us know if you need further assistance.