@taufiqueazad If you (or others seeing this thread) are looking for the correct answer:
Line 126 in ihaf.php
if ( ! current_user_can( 'unfiltered_html' ) ) {
$this->errorMessage = '<p>' . __( 'Sorry, only have read-only access to this page. Ask your administrator for assistance editing.', 'insert-headers-and-footers' ) . '</p>';
}
So you need to give the “unfiltered_html” capability to whichever user role you need to be able to use this plugin. Here’s a snippet I used to help me solve this issue:
https://kellenmace.com/add-unfiltered_html-capability-to-admins-or-editors-in-wordpress-multisite/
