Hello again ,
To edit any theme files, please build child theme first. You shouldn’t edit any theme files directly, as when you update the theme, all your edits will be reverted back to original. So, to me safe always build child theme, you can download the sample child theme from here
Then you have to remove your site branding and your search form
for that you can insert the below code in the functions.php of your child theme.
function unhook_clean_journal_functions() {
remove_action( 'clean_journal_header', 'clean_journal_site_branding', 60);
remove_action( 'clean_journal_header', 'clean_journal_header_right', 70);
}
add_action( 'init', 'unhook_clean_journal_functions' );
And after that for the site logo you can insert the below given css code form the custom css option given by the theme. It is located in Dashboard => Appearance => Customize => Theme Options => Custom CSS Options.
#masthead {
background: url(‘https://placehold.it/120×120&text=image1’) no-repeat center;
}
But If you do not want the logo, do not put the above custom css.
hope it works,
regards,
bplv