Welcome to the forums.
First, a quick note: In future posts, please try to write a title that describes your question, like "more than enough" instead of "I need help."
Second, THANK YOU for using proper capitalization. (That doesn't often happen here.)
It means I don't need or want any more of whatever is being discussed.
It could be negative: A mother is angry about her daughter's rude tone. "I've had more than enough of your rudeness, young lady."
It could be positiv: "Oh, thank you for that delicious meal. And no thank you, I couldn't eat another bite. I've had more than enough. It was so good, I ate more than I should have."
Edit: Fixed typo