Saving data to database

I am new to Appian and I'm creating a form interface to save data to the database. I've gone through several of the tutorials and I created an Interface and a Process Model that will save data to the database. However, it only works when I launch it from the Process Model. How do I launch it from the Interface by clicking on the Submit button? 

I want to click Submit after filling out the Interface and have it fire up the process model to save to the database. 

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