Code showing on front page instead of thumb-pics

Hello-my front page shows code where the thumbnail pics are supposed to be. All the other pages are Ok. I am using Market Theme and Network Solutions as my host. I was told I need to change the url domain name in the WP site to be the actual url of my business: https://www.musicgrowshere.com
Here’s what I was told: Quote “The error message is saying something to the effect of “anti off-site” linking. Basically, it may be having problems with your website using both “musicgrowshere.com” and “https://02cfd6d.netsolhost.com”.
It looks to me, like you need to get away from “https://02cfd6d.netsolhost.com”.
Do you have “https://02cfd6d.netsolhost.com” in your settings area?
If so, why do you not have “https://www.musicgrowshere.com” instead?
If you do have “https://02cfd6d.netsolhost.com”, make sure that you don’t change it if “https://www.musicgrowshere.com” isn’t the exact same path.
that’s likely the problem, because if you go to:
https://02cfd6d.netsolhost.com/blog1/
You will see everything working properly.” end Quote

Is this true? AND how do I fix it? Thanks!