Hi Stefano, i have the exact same problem here : http://www.globalwealthinstitute.net
I have Good Layer Theme, and the plugin Newsletter 4.7.6
In the configuration (plugin.php) page, see below what i have…
What do we need to change here ?
You maybe solved the problem? I have the same problem and I can´t find where to change the custom form. I found a lot of topics related to this problem in this forum, but it seems Stefano just doesn´t want to answer the question about where to change the form action.