By Brian O’Connell A new study shows U.S. teens want the finer things in life, but they don’t know how to pay for them. “Teach Your Children,” Crosby, Stills Nash and Young sang in 1969. The title resonates 50 years later when it comes to financial literacy. A new report says that American teenagers are sold on the American Dream — but they seem to have no idea how to pay for it. A Junior Achievement/Fannie Mae survey shows the vast majority (88%) of U.S. teenagers aspire to own a home someday, but report significant financial and homeownership knowledge gaps. The survey also says that 85% of…