I don't quite understand your questions.
If you are trying to install Wordpress, you can go to DH panel --> Goodies --> One-Click Installs --> Wordpress. If you are new to Wordpress, you can start with easy mode.
If you are afraid that you will screw up your main domain, create a subdomain and install Wordpress in your subdomain first. When you are confident about the installation, install it on your main domain.
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