In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize you will in theme Customizer.
Here you have to click on Page Template than Error Page
In Error Page Here you can Change Title & Description.
Go to Customize -> Page Template ->Error Page
In WordPress Dashboard go to the Appearance submenu and click on Customize.
After clicking on customize you will in theme Customizer.
Here you have to click on Page Template than Error Page
In Error Page Here you can manage Button Label & Image.
Go to Customize -> Page Template ->Error Page
