Form not in decision diamond

I have an internal form that gets filled and connected to a decision diamond… when I go into the diamond to create rules so that the contacts go into the proper campaign sequence there is no option to link the FORM to the rule… only “Contacts” come up… I did not build this campaign and don’t know how to get this diamond working. Right now if someone gets entered into the form the contact gets all of the sequence emails sent to them all at once… please help!!

The form has nothing to do with the rules but the RESULT of the form does. When the form is submitted, contact FIELDS get populated. Your decision diamond rules will be based upon the information in those fields or what tags get applied etc…