The page name and the folder it resides in determines the URL (website link). If you change the name of the page or folder, the URL will change to respectively.
To rename the link for your website please login to CMS > go to site manager > then choose the page from the list you’re looking to rename.

Open up the "edit page settings" .

Change the name of page > the click the save button.
Note: Changing the name of page will change the URL as well
