Help With Installation

Hi there, I tried installing WP onto a website I’m designing for my church.

The entire site is in HTML if this helps.

The link is https://www.fourthdimension.willowdale.com/blog

The blog comes up if you go to that link.

But when I tried to access the login page, I get these error messages:

Warning: Cannot modify header information – headers already sent by (output started at /home/fourthdimension/public_html/blog/wp-config.php:23) in /home/fourthdimension/public_html/blog/wp-login.php on line 9

Warning: Cannot modify header information – headers already sent by (output started at /home/fourthdimension/public_html/blog/wp-config.php:23) in /home/fourthdimension/public_html/blog/wp-includes/pluggable-functions.php on line 274

Warning: Cannot modify header information – headers already sent by (output started at /home/fourthdimension/public_html/blog/wp-config.php:23)
in /home/fourthdimension/public_html/blog/wp-includes/pluggable-functions.php on line 275

Warning: Cannot modify header information – headers already sent by (output started at /home/fourthdimension/public_html/blog/wp-config.php:23) in /home/fourthdimension/public_html/blog/wp-includes/pluggable-functions.php on line 247

I did not alter any of the documents except the wp-config.php with the required info as per the installation instructions.

Any help is much appreciated. Thanks.