go to the functions.php file,  which is located in the “wp_content” folder, in this folder you will find “themes” folder, select the theme which is currently running, and then click on the theme, there you will get the functions.php file, and write the code in last

use this function

<?Php wp_admin_bar('false'); ?>

in the functions.php file and that it, if you still have query you can check the 360smsapp and then  press “control + u”, you will see the source code, you will see that I have already hide the admin bar by using the function.