How do you set the ignition timing on 1995 Honda Civic EX?

Probably computer controlled and not adjustable

[edit] the ignition advance/retard is computer controlled but setting proper idle ignition timing can be done with a timing light an a 12mm wrench (I prefer a deep 3/8 drive socket).

hooking up your timing light (or someone else's for that matter) I'll assume you can figure out. there is a two-wire harness behind the passenger footwell (mine is actually above that stuffed under the far right side of the dash board).. you'll need to connect those two wires with a piece of wire or paper-clip. then, with the timing light hooked up, start the car and let it warm up to operating temp. once its up to temp set the timing light to 16 degrees (advanced)... there is a little v-shaped piece that sticks off the lower timing belt cover that will line up with the timing mark on the crankshaft pulley (just below the v-shaped notch).. when the timing light strobes the two should be lined up, if they are not then loosen the three 12mm bolts that hold the distributor on (loosen, DO NOT remove them) and slowly rotate the distributor until the mark lines up with the notch. once they are lined up, re-tighten the bolts on the distributor.

Note: I have a 94 civic Si which has the same motor as your 95 EX and my service manual lists idle timing to be set to 16degrees BTDC (before top dead center).. check with your local shop or a Honda service manual to double check your proper timing setting.