In WordPress Dashboard go to Appearance submenu and click on Customize.

After clicking on customize the theme Customizer page will appear .

Here You have to follow this Path : Go to Customize -> Page Templates -> 404 Page 

Now scroll down till Title and here you can Add Section Title , Subtitle , Description & Button Label in 404 Section in 404 Page.

NOTE : Please First enable the Hide/Show Section to display 404 Page Section

Then click on Publish.

Please follow this Screenshot for Reference :

Leave a Reply

Your email address will not be published. Required fields are marked *