To Configure your Contact Form go to Configure Site > Basic Setup, Contact Form section, and fill-in/edit the configuration settings.  Leave any field blank to not use in the contact form, mark which fields should be required fields and they will be marked with a * after the Field Name (plus a check if they are filled in after user clicks the Submit button) - you choose the Field Names.  Optionally add a menu to the form and allow file attachment uploads too.

Inserting the Contact Form into your page(s):  You can insert your mailing list form into any page you create at anytime - any updates you make to it will automatically be updated for each instance.  Insert your Contact Form from the bottom of any Add / Edit Page in your Admin Panel - set the "Include Contact Form On Page" option to Yes, then click on the Placehold Text box to copy the Placeholder Text to your clipboard; finally, click on the editor box for your page where you want it, and paste it.  Your contact form will display there.