aneahill review for Mailchimp Email SMS Marketing

Well, I hate to do this but I am at step one and can't stop getting a sad face saying ShopSync refused to link. I wrote in and followed the instructions 6 times and with no luck I am unable to get the app to simply install. Reviews aren't good so maybe this is my sign to move on. If anyone knows of an email-out system that works for them, please share. Thank you