Hi kim taewook
Thanks for contacting us.
Please Enable the theme info area section in the customizer and you can edit the theme info using customizer option.
So please Go to Appearence >> Customize >> Frontpage Sections >> Theme Info Area
See the screenshot http://prntscr.com/ufe4yp
And please add the below CSS code to remove the Theme Info Area from the Homepage.
GO to Appearence >> Customize >> Additional css box.
.page-template-frontpage #theme-info-area {
display: none;
}
Let me know if it works.
Thanks