When you're done, you can click on the 'Close' tab on the floating bar. The items in the header and footer will appear greyed out, but don't worry; this only means the they have been set. The cursor will then appear on the first line where you can begin typing your letter.
Finally _ Naming Conventions _ While setting a standard for your future documentation is a step in the right direction, you must also pay attention to being able to recall those standards for future use. Ensure you name your templates effectively so that they can be brought up for use at a moment's notice.