Changes in functions.php doenst seem to work

@knudkp:If you want to make any changes in theme I suggest you to make modifications via child theme. If done so, the changes will not be lost after update. Please put the code in child theme’s functions.php file and Let me know if this works out or not?

Kind Regards,
Sapana

@knudkp: In your above code you have miss the (;) and also not remove comment (/**/) due to which your code wasn’t running well. I have corrected and uploaded the code please use this code. Before using code make sure you are working on child theme. I strongly prohibited to make any modification in parent theme. You can use Generate child theme plugin to create child theme.

/** Stop login form shake on error */
function my_login_head() {
    remove_action('login_head', 'wp_shake_js', 12);
}
add_action('login_head', 'my_login_head');

/** Stop login form error msg. */
function no_wordpress_errors(){
    return 'Something is wrong!';
}
add_filter( 'login_errors', 'no_wordpress_errors' );

/** Stop login form and its lost password */
function remove_lostpassword_text ( $text ) {
    if ($text == 'Lost your password?'){
        $text = '';
    }
    return $text;
}
add_filter( 'gettext', 'remove_lostpassword_text' );

Let me know if this works out!

Kind Regards,
Sapana

@knudkp:I tested the code it was working fine in my end, creating child theme is the best way to make any changes in the theme.
Go to => Child Theme Folder => functions.php and add the previous provided code.
Let me know if you still face any problem

Kind Regards,
Sapana