UserName and Password

I have installed Nextcloud + Collabora using the following link but unable to find login username and password in the scrip file on this Start to Finish Nextcloud+Collabora Step-by-Step Guide

Please let me give password and also give a clue about collabora ssl file details coz there you mentioned that copy and paste as mentioned below:

Now we need to alter the Apache config file for the SSL secured virtual host that will serve Collabora

sudo nano /etc/apache2/sites-enabled/

Look for the following two lines in this file:

Include /etc/letsencrypt/options-ssl-apache.conf

Between these two lines copy and paste the following lines of code:

where is this file and from where i create this please.