You are confusing the example placeholder content in the template with the design. The newsletter sign up is just a placeholder as is the rest of the content in the page of the template, it is not really part of the design its just filler to show what the design looks like with some content.
In a CMS the content comes from the database. If you want a newletter sign up then create a newsletter in mojoportal and add a newsletter sign up module to the page.
Hope it helps,
Joe