How do I check the engine codes on a 93 Honda Accord LX?

My check engine light will not go away and my D4 light keeps flashing. I looked up online to see how to check for the codes, but all I could find was random people talking about random ways to do it. I need clear step by step instructions for dummies (Not saying I'm dumb but using adjectives work best for me).
Keep in mind I'm a girl and I really don;t want my boyfriend helping me because that will just start up a bunch of mess because he's a dumb ass when it comes to cars (his mother's boyfriend tells him that all the time)
So please help me and remember K.I.S.S.
 
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