Locked out of my site

Hi All,

I could use some help. This morning, I went into my settings and changed my site’s address from:

zionadventures.com/ZBlog/
to
https://www.zionadventures.com/ZBlog/

because I thought it would be better to have the “www” in there for SEO reasons. After I did this, I was locked out of WordPress and my blog site no longer works. When the internet tries to find the site, it appears to bounce between the two addresses and eventually comes up with the error, “The page isn’t redirecting properly.” Obviously, this was a dumb move. But how do I get back in there and fix it? I imagine the answer is in a piece of code in my blog folder, but which piece and where can I find it?

Thank you for any assistance.

Humbly,
Nick