how do i remove clutch hydraulic line from bottom of reservoir on a 98 chevy cavalier??

the line appears to have a pin holding it do the bottom of the reservoir. the new line came with a new pin and a small o-ring. I havenot  been able to remove that pin. also, tried to remove clutch master cyl. & reservoir as a whole so i could remove the line, but i cannot remove the pushrod from the pedal either. any help with these probs would be highly apreaciated. thank you.