How do i load a shot gun?

I have shot pistols and rifles before but i have never used a shot gun. I know where to put the shot gun shell but which way is it supposed to face? Thank you for the help.
Update: Look my shotgun didnt come with a manual. I got it used but it was in perfect condition.
Update 2: I put the wrong thing in when I first typed the question. I have shot a shotgun before but I have never loaded one before.
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