Hi Hyunjoo
Thanks for reaching out 🙂
Remove the attribution link from Appearance > Theme Settings > Footer Attribution Link
(near the bottom).
Comments can be globally disabled from Settings > Discussion
. Global settings for comments don’t change the comment settings for individual posts or pages. To turn off comments on a specific post or page, edit it, click Screen Options
top right, enable Discussion
and then scroll down to the Discussion meta box below the Visual editor where you can disable comments. For more on comments and disabling, please, see: https://purothemes.com/documentation/general-wordpress/disable-comments/.
Let me know how it goes.