You have one chassis fan header on your motherboard (and one CPU_FAN header). The lack of fan headers does not prevent you from adding fans using the molex connectors from your power supply (the fans will run at constant 'full' speed then). There are also fan controllers available which usually are powered by a single molex and can control multiple fans.
Even if your MoBo doesn't have enough system fan headers, most fans also have leads for the peripheral connectors on your power supply. That specific board has one cpu fan header and one system fan header.