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Open your Microsoft Word document. Click File. Click Options. Click the Add-ins tab. Click the "Manage" drop-down box. Click Templates. Click Go…. Click Attach…. Select a template. Click Open. Check the "Automatically update document styles" box. Click OK. Save your document.
Double-click the document to which you want to apply your template. This will only work for recently-opened templates. If you haven't recently opened the template you want to use, open the template and then close it before continuing. It's in the upper-left side of the page. You'll find this in the bottom-left side of the "File" page. It's on the left side of the Options window. This box is at the bottom of the Add-Ins page. A drop-down menu will appear. It's near the middle of the drop-down menu. This button is to the right of the "Manage" drop-down box. It's in the upper-right side of the page. Click a template that you want to use. It's at the bottom of the Template window. This will open your template. You'll find this box below the template's name near the top of the page. It's at the bottom of the window. Doing so will apply your template's formatting to the document. Click File in the upper-left side of the page, click Save As, double-click a save location, enter your document's name, and click Save.