Apache Friends Support Forum

I can't seem to find up to date instructions on how to configure Apache to be able to access wordpress on another computer under the same wifi.

localhost always points to your very own computers network loopback adapter. You cannot use localhost for requests from another computer.

Enter the LAN IP (instead of localhost) of Xampp Server in your browser to access Xampp. No modification in Apache necessary.

If you already installed WordPress, edit wp-config.php and replace all occurences of "localhost" by the LAN IP as well.

I tried making changes to the wp-config.php file but when trying to access wordpress i was prompted with "Error establishing a database connection".

Then you probably changed the DB_HoST variable from localhost to something else. That is not the setting you need to touch.
You need to tell us much more in detail what you are doing exactly.

If it is an option for you, you should install wordpress fresh by using the LAN IP. That is the easiest way to get a working wordpress configuration.
Or google for "Change Wordpress base url" or "wordpress migration from localhost to server"