For anyone else having trouble getting the newsletter sign-up to work on the IT Professional theme homepage, you can hide this section by going to Appearance > Customize > Additional CSS and adding the following CSS:
#foot-top-sign{
display: none;
}
This feature would add great value to the template. I look forward to a solution, so I can utilize it. These themes are beautiful and amazing and are worth twice their price with a little more documentation.