Header warning error

Hello,

I had a blog set up at https://www.idosignatureevents.com/blog. Then she wanted that to be the website, so I moved the WP files into the root of the web space.

Now she wants the blog back the way it was with static pages for the website.

I changed the Settings area to point to the /blog again before doing anything.

The blog itself is fine now at https://www.idosignatureevents.com/blog, but I can’t get to the Admin area. I am getting this error message:

Warning: Cannot modify header information – headers already sent by (output started at /home/idosigna/public_html/blog/wp-config.php:46) in /home/idosigna/public_html/blog/wp-includes/pluggable.php on line 865

Does anyone know what I need to do to fix this?

Thanks!
Rhonda