roundcube doesn't login after installation

I was trying installing roundcube on my apache2,ISPCONFIG3 server, on my LAN using : https://www.howtoforge.com/using-roundcube-webmail-with-ispconfig-3-on-debian-wheezy-apache2 with the following changes : remoteuser roundcube pass password809098 and https://www.rosehosting.com/blog/how-to-install-roundcube-webmail-on-ubuntu-20-04/ with these changes :

GRANT ALL PRIVILEGES ON roundcube.* TO roundcubeuser@localhost IDENTIFIED BY 'password';

nano /etc/apache2/sites-available/roundcube.jungsf.tv.conf
a2ensite roundcube.jungsf.tv
<VirtualHost *:80>
  ServerName roundcube.jungsf.tv 
  DocumentRoot /var/www/roundcube/

  ErrorLog ${APACHE_LOG_DIR}/roundcube.jungsf.tv_error.log
  CustomLog ${APACHE_LOG_DIR}/roundcube.jungsf.tv_access.log combined

    Options FollowSymLinks
<Directory "/var/www/roundcube/">
    AllowOverride All
</Directory>

    Options FollowSymLinks MultiViews
<Directory "/var/www/roundcube/">
    AllowOverride All
    Order allow,deny
    allow from all
</Directory>
</VirtualHost>

I managed at end to get the roundcube web interface through http://jungsf.tv/webmail but it still doesn't log in, I don't know which password/username should be, I tried all combinations roundcube/roundcubeuser/email .... password,PASSWORD,password809098

how can I find the user/pass or how can I delet everything to reinstall it ? I saw this plugin to set pass, but how can I use it ? https://github.com/saas-dev/roundcube-forgot_password

Solution

I managed to work it by creating mailbox in ispconfig3, there I entered email and pass which are used to login in roundcube.