Blog post URL issue with Wix!

[aquariumkids.com]

I help run a Wix site for a local nonprofit. We are having some issues with our blog post URLs.

Blog post URLs should look something like this:

http://www.SITENAME.org/single-post/YYYY/MM/DD/BLOG-TITLE

However, ours look like this:

http://www.SITENAME.org/blank-6/YYYY/MM/DD/BLOG-TITLE

The "Single Post Page" url is set to http://www.SITENAME.org/blank-6. There is no option on the SEO tab for the Single Post Page to change the URL. How can we change it to "single-post" instead? This is creating issues with our website email list.

Thanks in advance!