How to change the Theme's default pop-up notifications? (Newsletter Sign Up, Added to Cart, etc..)

Hi, @etshology87

Firstly, I would like to say sorry and thank you so much for your patience. I was not well in the past few days so I could not go online.

Could you please let me know more details about what you want to change this notification? I will check then give you the correct answer

Thank you so much!
Regards,
Yame