You'll need a timing light. They come with instructions, but it goes something like this...

Get the engine warmed up properly, like after you've just come back from driving around. I think your car has a service connector buried somewhere above your passenger's right foot. You have to short the 2 wires together with something like a paper clip. I hope someone comes up with the details for your car...

Clip the power leads onto the battery posts. Clamp the inductive lead around your #1 spark plug wire. Loosen the mounting bolts for the distributor. Start the engine.

Shine the timing light onto the crank pulley, it will freeze it's rotation so you can look for the little notches cut into the pulley. Twist the distributor so the red(?) one lines up with the pointer on the timing cover. Tighten the distributor & check it again.