Hey Ryan,
I believe you are mentioned this subscription module right? check my screenshot here :
http://take.ms/o3U5T
If yes and if you enabled Mailchimp integration from your Easyblog backend, Mailchimp will take responsible to send out the notification to your new subscriber for this.
So I have a question now, are you still using Mailchimp integration? If yes, can you provide us with your mailchimp user access so we can better have a check?
Ahh, I forgot to response this in earlier, this is your template css override the styling, so it show blank pop up.
I did applied some css fix into this file ->
/public_html/templates/blog/html/com_easyblog/styles/custom.css, it should show the text now.