Step 2: Click Edit Website then Edit Settings
Step 3: Click on Shortcuts > Webpages
Step 4: Editing Webpage
Click edit on the webpage you want to edit.
Navigate to the Search Engine Marketing section below the page editor
Change SEO URL to what you would like. Click Submit. Copy the Blue URL from /page to the end.
Setup > Menu Builder > Top Menu Links
Click Edit > Check the file name box > paste your new URL into the box > Click Submit
Step 10: Test Webpage
Step 11: Hard reload the browser if its not working.