Hit a brick wall

[Bikemen]

Here's where I got lost...

Step 3: Make your website host challenge files

You must prove you own the domains you want a certificate for, so Let's Encrypt
requires you host some files on them. This script will generate and write those
files in the folder you specify, so all you need to do is make sure that this
folder is served under the ".well-known/acme-challenge/" url path. NOTE: Let's
Encrypt will perform a plain HTTP request to port 80 on your server, so you
must serve the challenge files via HTTP (a redirect to HTTPS is fine too).

# Make some challenge folder (modify to suit your needs)
mkdir -p /var/www/challenges/

# Example for nginx
server {
    listen 80;
    server_name yoursite.com www.yoursite.com;

    location /.well-known/acme-challenge/ {
        alias /var/www/challenges/;
        try_files $uri =404;
    }

    ...the rest of your config
}

[adelton]

Could you elaborate what part of this documentation gives you troubles?