To change your Facebook Page URL, follow these steps:
Go to your Facebook Page and click on the "Settings" button at the top right corner of the screen.
Click on "Page Info" on the left-hand side of the screen.
Find the "Username" section and click on "Edit" button.
Enter a new username for your Page. This username will be used in your Page's URL, so choose carefully.
Check the availability of the new username. If it's available, click on "Create Username" to set your new Page URL.
If the username is not available, try a different username until you find one that is available.
Keep in mind that changing your Facebook Page URL may impact the links to your Page on the internet and other websites, and it may take some time for search engines to update their records. It is also important to note that you can only change your Page URL once every 14 days, so make sure you choose a URL that you'll be happy with in the long term.