Word normally uses the bibliographic style currently selected in EndNote. You can easily change this in Word to any other style you have selected as a "favourite" in EndNote.
Select the EndNote tab and choose the required style from the Style drop-down list. The document will change to the newly selected style automatically.
If the style you need is not displaying in the drop-down list, choose Select Another Style… to select from the entire list of available styles.
You can change other reference list/bibliography options, such as including a heading, indenting, and line spacing between references.
Select the EndNote tab and click the button in the lower right of the Bibliography group to open the Configure Bibliography dialog box, then click Layout.