I am getting the following error on my website
Your connection is not private
Attackers might be trying to steal your information from smudgespray.com (for example, passwords, messages, or credit cards). Learn more
This is a pretty common problem with a fix that might take a couple of days to rectify once you fix it.
This thread here is a good starting spot and Oliver gives some good guidance.
The Shopify help center has a section on SSL which will help you understand what is going on with your website.