To change Page URL on Squarespace, you can follow these quick steps.
Note: Changing Page URL can affect SEO.
#1. Hover on page where you want to change Page URL and click Gear icon
#2. Change Page URL in URL Slug then click Save
#3. After changing the URL, you can consider redirecting the old url to the new url in URL Mapping to avoid SEO.
Access Settings > Developer Tools > URL Mappings
