Watch people whistle and emulate them. Sometimes these kind of tricks-of-the-trade can take a bit of perseverance and stubbornness to make happen (like rolling your R's). You can look up guides online, then practice at least 10 min a day (can people whistle for an hour? o.o)
It might come out as you just blowing air for a while. That's okay. Baby steps will lead to success.
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It's just another day.
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