Hi GhostSailor, welcome to the forums. If you're using the Pro or Ultimate version (not Lite), you can right-click a date in the Month view and select "Day Background -> Color" to fill the date with a color. You can also color multiple dates at the same time. To select a range of dates, click the first date, hold the Shift key, and then click the last date. You can also select individual dates by holding the Ctrl key while clicking. The specified color will be used for all selected dates.
See the page linked below for more details:
http://www.vueminder.com/products/vuemi ... round.htmlI hope that helps. Please let me know if you have any other questions.