where do i add the oil at in my 1988 chevy truck?

I cant figure out where to add the oil in my 1988 chevy truck i just baught this 2 days ago and im not really good with vehicles!
 
the cap in the valve cover

Pay no attention to the answer above me, he was standing on his head reading it upside down LOL
 
like the other guy said, its a cap on a valve cover, it will either have "OIL" or "710" if its upside down haha, but it could also have the picture of an oil can on it, just like the oil light on your dash
 
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