GOautodial Open Source Omni-channel Contact Center Suite

Hi I am new here in goautodial hoping you could help me on my issue.

I am currently installing a goautodial in my centos 7 that is located in the cloud someone from the support live chat named CLINT gave me this link where I can follow a guide http://www.goautodial.org/projects/goautodialce/wiki/Centos7.

But along the installation, I installed these components ( i'd just copy-paste the command in the guide to my system).

yum install -y httpd php-common php-pdo php php-pear php-mbstring php-cli php-gd php-imap php-devel phpsysinfo php-mysql phpmyadmin mod_ssl mariadb mariadb-server mariadb-devel

Then after, when I am now doing this systemctl enable httpd.service; systemctl enable mariadb.service

I received an error just like this : Failed to execute operation: Access denied

could you help me on this as this is the first time I used this goautodial.

Thanks.