Sub-domain Help Needed

I have set up a domain to be redirected. I set the domain on my main domain as a sub-domain, I need to enter the complete domain name plus the root directory for the site to be live. Do I need to install the domain as a add-on instead of a sub-domain to avoid having the complete address in the brower?

 

1. Log into your cPanel.
2. Go to the Domains section and click on Subdomains.
3. Type in the name of the subdomain and select the domain to create it under. It will automatically create a folder for the subdomain in your public_html folder.
4. Click the Create button.