Los artículos indefinidos un, una, unos, unas, en inglés se dicen:
Un / una
A
Unos / unas
Some
Por ejemplo:
Un amigo.
A friend.
Una flor.
A flower.
Unos amigos.
Some friends.
Unas flores.
Some flowers.

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You can see how this popup was set up in our step-by-step guide: https://wppopupmaker.com/guides/auto-opening-announcement-popups/