You can create a subdomain on your current one. But you CANNOT have two x10hosting accounts which is what you would require to have two websites. this would Violate the TOS. If you require assistance creating your subdomain feel free to ask here.
Or you can make another x10hosting subdomain in your account, hosted in a subfolder of your public_html and have a different website. You can do this with "Addon domain" from cPanel.