Hi;
This software is provided free of charge, so that’s it’s hopefully useful. I took the time to write it, test it and release it. If you’re going to leave a 1-star review (or 3 as you actually appear to have done), on a plugin that everyone else has rated 5-star – it would be great if you could take time to clearly describe the problem you’re having in a polite and courteous manner.
As it is I have *no* idea what you’re missing, or what you’re finding difficult, and so no idea how to help you – this plugin doesn’t require a “domain” anywhere in its set up.
If you’d like support on the plugin, then please do feel free to post in the support forum: https://wordpress.org/support/plugin/ajax-campaign-monitor-forms with as much detail as you can.
While I don’t provide detailed technical support on my free plugins free of charge, if there’s simple advice I can give you – I’d happily do so.