Help!

I've started signing up for races for next year (okay, one race, but it's still a start). I want to put one of those charts in the sidebar. Can someone tell me how to do that? As a law student, I have mastered things like the finer points of using bullet-point lists and formatting headings and page numbers, but I am pretty clueless with things like HTML. Hence my newfound preference for posting from a PC instead of my Mac. Anyway. Help?