Word 2007 change theme fonts?

Hi I need to change my theme fonts. the body is calibri and i want it to be times new roman. How do i change that?Word 2007 change theme fonts?
Under the Home tab, click the Styles group button to open the Styles window.

Click the Manage Styles button, which is third from the left at the bottom of the Styles window.

Select the Set Defaults tab.

Scroll to and select Times New Roman under Font.

Under Size, select the size you wnat.

Select the Only In This Document check box.

Click OK.