How can I add a “location specific include” to customize my nginx config?

Hi,

I′m new to server configuration and new to this forum. I need to add some lines of code to the nginx config file to fix a database connection error which I got after switching WordPress to Multisite (subdirectory variant, *not* subdomain).

I switched WordPress to Multisite by editing the wp-config.php file with the FTP-client *FileZilla*. I added the following line just before *‘That’s all, stop editing! Happy blogging’* in the file.

/* Multisite */
define(‘WP_ALLOW_MULTISITE’, true);

Here are the steps I follow and where I get stuck:
1. I connect to the server via SSH.
2. I enter the command vim /etc/nginx/sites-available/mysite
3. The config file is displayed which starts with
*Prometheus_vHost_Begin.
HTTPS.
Do not edit directly.
All changes will be lost.
Please use a location specific
include to customise your config.*

**My QUESTION: How can I add a location specific include to customise my config?**

I think I will need some further help to get my self caused database connection failure solved.

Background:
I followed the instructions of this great YT-tutorial >> [(117) How to Setup WordPress Multisite on Nginx – YouTube](

• https://www.youtube.com/watch?v=S_KzKbP_w-E

) << which tells me to add some lines of code to the config file which can be found at this link >> [A Comprehensive WordPress Multisite Setup Tutorial for Nginx – Tony Teaches Tech](

• https://tonyteaches.tech/wordpress-multisite-nginx/

) <<

Here is the code I need to add if that is of any importance:

` # Rewrite requests to /wp-.* on subdirectory installs.
if (!-e $request_filename) {
rewrite /wp-admin$ $scheme://$host$uri/ permanent;
rewrite ^/[_0-9a-zA-Z-]+(/wp-.*) $1 last;
rewrite ^/[_0-9a-zA-Z-]+(/.*\.php)$ $1 last;
}`

Thank you very much in advance for any support!

Gunnar