You also have several templates to choose from with Open Office software, but Microsoft Word provides a wider selection. However, if you do find a template that seems good enough and you'd like to customize it, go to Wordlabel.com to download the file. To open it, right click Open With and then select the software. You can then modify it however you want.
Click on 'Insert,' again at the top of MS Word. When the menu appears, let your mouse arrow hover over 'Picture.' Here you'll have several options. You can create your letterhead on the fly using some of those options. However, for our purposes we'll opt to choose 'From File,' since we already have a ready graphic. Click on the option, 'From File,' and a dialogue box opens. Locate your graphic and then click on it and then click the 'Insert' button. Your graphic will then appear inside the dotted box.