Modal Pop ups & Forms


Would like some advice on how to proceed.
Created a modal for a mailing list pop up
Problem is, the success prompt is unable to close to return to the home page
How do i fix this

Also once that is fixed, when the visitor returns to the home page, i don’t want the pop up to show again

Can anyone advise, or direct me to some videos for help
Thank you in advance

Here is my site Read-Only: