As one of our Technical Support team member has previously mentioned, there is no function to modify the URL link in website creator. However, if you are a novice webmaster who has no coding background, we strongly recommend you considering to create your website with WordPress. WordPress is an open source content management system. There are over thousands of themes available for download for FREE. Once you install the WordPress and choose the themes you like, your website is all ready to launch.
Check out this article which features WordPress in our Scripts LibraryHow to install WordPress
PS, FYI, our Scripts Library website is built with WordPress