Could you provide more detail with what you mean? What pop-up error messaging system are you referring to?

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Chris Hammond
Former DNN Corp Employee, MVP, Core Team Member, Trustee
Christoc.com Software Solutions DotNetNuke Module Development, Upgrades and consulting.
dnnCHAT.com a chat room for DotNetNuke discussions

Not really something that would do with DNN, looks more to do with however the newsletter signup code works. I'd imagine it would be handled by some Javascript associated with the signup form. There are many third-party solutions for creating forms with validation and some allow you to define the message that displays when validation fails. However, in the image you linked it looks like a run-of-the-mill newsletter signup form.

That being said, to integrate form code into DNN, you will need to make a couple small changes to the HTML since you can't have a FORM inside a FORM ( a DNN site is essentially a large Form to begin with). For those modifications, you can refer to this post by John Mitchell

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Wells Doty Jr
Online Content Development