Just recently repalaced the clutch in my 2003 hyundai tiburon also the master and slave cylinder since then it will not go into first or second gear. Could you please help me out on this situation.

Did you bleed the system properly? Does reverse work? Also why did you initially replace the clutch?

Yes Sir it has been bled and the clutch was replaced because the throw out bearing was bad in it, And yes reverse does work but when you put the car in reverse you have to hold the shifter into place in order to back up.