How can I hide the publish button, when I edit or add new page or post
You can use jquery or css to hide WordPress Publish button.
function softwarehtec_hide_publish_button() {
?>
<style>
#publishing-action { display: none; }
</style>
<script type="text/javascript">
jQuery(document).ready(function(){
jQuery("#major-publishing-actions").html("");
});
</script>
<?php
}
add_action( 'admin_head', 'softwarehtec_hide_publish_button' );