Drop down arrows on main navigation bar

website is https://www.iam737.org for reference

Hi iam737

If you can use PHP

add filter code at functions.php

add_filter( 'wp_nav_menu_items', 'extend_wp_nav_menu_items', 10, 2 );

function extend_wp_nav_menu_items( $items, $args ) {
	ob_start();
		the_widget( 'WP_Widget_Categories', 'dropdown=1&count=1&title= ' );
	$dropdown_data = ob_get_clean();

	return $items . '<li>' . $dropdown_data . '</li>';
}

screenshot of above filter

https://www.tenman.info/wp3/manualraindrops/files/menu-dropdown.jpg

Looking at your screenshot , it looks like you are adding a dropdown menu. I want to remove the arrows next to my menu names. I am not extremely experienced so any help will be appreciated.
Not really sure what php is? I think it is the code imbedded into the page, which I do not remember how to do.

If you can not use PHP

Raindrops support hover dropdown menu

https://codex.www.ads-software.com/WordPress_Menu_User_Guide