On Civic and CRV models, Integra models use Nippondenso starters which have non replaceable solenoids if the solenoid itself is out of order you must replace the entire starter which is a difficult and expensive replacement. Unplug the cable from the negative terminal of the 
Battery and if the radio is equipped with an anti-theft system make sure you have the proper activation code for the radio before you begin. On Civic, disconnect the large wire from the solenoid to the 
Starter Motor terminal, then remove the long bolts securing the end cover to the gear housing, and remove the armature housing. Then, remove the screws from the gear housing cover, then remove the screws from the gear housing that hold the solenoid to the gear housing. Reverse of removal, install with the grease on the solenoid plunger and lever and a little grease on the solenoid plunger and lever. To disconnect the large wire from the solenoid to the starter motor terminal, remove the solenoid mounting bolts, pull the solenoid out of the gear housing, disconnect the solenoid plunger on the solenoid lever. Like with the Civic, to remove installation is the reverse of removal, applying grease to the solenoid plunger and lever to the machine.