Hello,
Your newsletter form does not work. https://iel.mx/a/
Check the form and plugin settings or there is a plugins conflict. In order to detect which plugin causes the conflict, deactivate all not related to the theme, check the issue, if the form works, activate the plugins one by one, checking the issue each time, and you will be able to detect the problem.
If the problem not caused by plugins, refer the plugin documentation or support and configure the form properly.
Best Regards