My daughter has been attempting to connect to on of my blog articles to share through her social media accounts. When she tries to connect, she receives the error message below.
Her Instagram gives this message:
I have my blog security set as follows:
These issues are far beyond my technical expertise. How can I ensure that this is correct? Any help will be appreciated! 
If needed, my blog is here.
She is trying to share this article.
What does it bring up when you click the “Learn how to fix it.” link in the ‘blog security’ screen shot?
Your domain is at https://barrett-mosbacker.squarespace.com. The error message is for https://barrettmosbacker.com which does not have an SSL certificate. The link you posted to the article is working properly and is using the certificate posted below.
An SSL certificate is needed for barrettmosbacker.com
Just seconding WayneG’s observations. I see in your Squarespace screenshots that barrettmosbacker.com is theoretically connected to your Squarespace account, so you might want to review their suggestions here and contact their support if those don’t help. If the domain is fully under their control, they should be able to issue you a new certificate for that domain.
