Some reports which don't otherwise have a home, and some who do, are available under Advanced/Custom reports. Open the advanced/custom report link from the Reports panel. Select one of these reports or one that you've created and saved on your own.
This report prints all people whose birthday appears during the provided month. Note the Ignore year portion of date checkbox on the Date of birth filter: it tells VSys to only look at the month and day portion of the dates when filtering people.
For birthdays in February, use "2000" as the year. Why? It's a leap year, and to get those people born on February 29th, you can't use a non-leap year and still be able to specify that day! (Any other leap year will work, too.)