You can add pages by going to your cpanel @ https://x10hosting.com/control/ and then go to cpanel from the link there. At this point you can either code your website in any language or at the cpanel you can use the file manager( looks like a file) to either add code in or add pages through uploading.
I suggest using http://www.w3schools.com/ as a way to learn coding if you need to. If not you can imediatly start coding a .html or .php file to put in your website