Word allows you to alter the page margins. You can do by clicking Page Setup from the File menu. The Margin tab allows you to change the margins and configure a few additional options. You can use the up and down arrows under the Margins heading to change the margins in your document.

After you have configured the new margin settings, you can click the Default button at the bottom of the dialog box. This will update the margin settings in the template from which the document is based.

Alternatively, you have the option of only changing the margins for specific text within a document. Select the appropriate text and then open the Page Setup dialog box. After you have altered the margin settings, use the drop down arrow under Apply to and click Selected text.