How do you say this another way?
You're welcome to it.

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Feel free to take it! 
You're welcome to have it. 
You're welcome to take it.

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knock yourself out ( colloquial expression )

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“You’re welcome to have/take it.”

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You can have it..
Please take it if you want.
Please take it if you want to.
It's free. Take it.
This is not taken. It's yours if you want it.
It's for you.
... a little further from what you wrote ....
It's yours.
This one is without a home.
Free to a good home.
It's yours at no cost.

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This means "You can have it". Is this what you intended?
.
This is different from "You are welcome".