It is normal for the cat to hiss at something other than the kitten - it is called re-directed agression.

If you can start over again with an introduction it might help. Usually cats shouldn't meet each other face to face for a week or so. Here is a webpage with some tips about how to properly introduce a new cat into a household:
Feline Behavior
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Smile, it will make them wonder what you are up to!

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