Cats need to get used to each other, they're very typically not instant friends. Google 'new cat introduction' and you'll get tons of articles on techniques to use that involve keeping the new kitten isolated for a while, swapping linens to allow them to get used to each other scent etc.
The techniques are all solid, but the most critical aspect is your judgment as to how they're progressing and when they're ready for the next step. There's going to be some hissing and growling, as long as it's not an all out fight...stay out of it and let them work it out.
If a fight does break out, don't intervene with any of your body parts...you'll get hurt. Use a squirt bottle.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...