Super noob pop-up help

New Member
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Hello everyone,

As stated, I am very new at this and have been learning over the course of the last few months.  I have just started working on email campaigning, and have added the sendinblue app for this.  It allows you to generate a newsletter pop up.  Where I need help now is integrating this pop up into my site.  I am using the brooklyn theme. 

So, here is my question - how do i intergrate a pop up on my site that will come up right when someone visits?