Where is the clutch fluid for a 2003 harley-davidson superglide?

If by clutch fluid you mean primary fluid? You must take off the derby cover (left hand side if sitting on bike) place bike on a lift or have a buddy stand it straight up. Must remove your chain inspection plug which has to Allen heads in it in the center of your primary. pour fluid into this hole and just as the fluid comes up to the clutch basket stop pouring bolt the derby cover back on and close up chain in spection hole and your ready to ride.