As long as you have access to the page and a direct admin role on that page, you can change the username on the page very effortlessly.
New Pages Experience
1. Go to your Facebook Page
2. Go to Settings
3. Under “General Page settings” go to “Username” and click “Edit”
4. Click “Save Changes” if the username is available
After this process, your username change will automatically take effect.
Classic Pages
To change your name in Classic Pages:
1. Go to your Facebook Page
2. Click Edit Page Info
3. Under General, edit the username and confirm changes.
After this process, your username change will automatically take effect.
