How do you make a public announcement while controlling an airport?

So I was flying yesterday and a controller said “attention all aircrafts, KLAX Tower is closing in two minutes” something like that, I was controlling an airport earlier today but I couldn’t figure out how you make those public announcements, can someone tell me?

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You click on “Broadcast Message” and you should see it ;)

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Click on any aircraft and then “Brodcast Message” :).

Thank you so much! Have a good day!

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