Big Contact Epic Failure sending and receiving emails

Don’t have any computer programming skills at all and trying to develop a website for my daughter. mandycyrartist.com which was going fairly well and the contact link was working before through the Big Contact plugin, now it’s not. It was saying the message was sent, but it was never received. I deactivated the plugin, took the contact off the page and then reentered it and now I am getting an ” Epic Fail ” message and getting very discouraged. I am sure it is some sort of programming or terminology, but have no idea how to go about fixing this.

https://wordpress.org/plugins/bigcontact/