Menu Hover colour

Don’t understand do you need help regarding hover color, making child theme, CSS generally, or all of it, anyway:
1-Menu hover color in Hueman – https://www.ads-software.com/support/topic/changing-navigation-text-colour?replies=3
2-WP child theme in Codex – https://codex.www.ads-software.com/Child_Themes
3-Best online CSS / HTML /PhP (+ more) schools – https://www.w3schools.com/
4 – PLS mark [resolved] if no additional questions.

Hi
Refering to the menus as i hover the mouse over to select.
Background is black. Menu is white text.
Want text to be purple for eg on hover.
I did try

#nav-topbar .nav li a { color: #666; }
#nav-topbar .nav li > a:hover,
#nav-topbar .nav li:hover > a,
#nav-topbar .nav li.current_page_item > a,
#nav-topbar .nav li.current-menu-item > a,
#nav-topbar .nav li.current-menu-ancestor > a,
#nav-topbar .nav li.current-post-parent > a { color: #222; }

Also have this code at moment: (but enabling or disabling is not working.

http:shinealivenow.com

#nav-topbar .nav li a {
color: #FFFFFF;

/*.menu li a:hover {
background-color:#71953d;
} */

.menu li a:hover {
background: #71953d;
}

/*
#nav-header .nav li a {
color: rgba(255, 0, 255, 0.7);
}

This:

#nav-topbar .nav li > a:hover { color: red; }
#nav-topbar .nav li:hover > a,
#nav-topbar .nav li.current_page_item > a,
#nav-topbar .nav li.current-menu-item > a,
#nav-topbar .nav li.current-menu-ancestor > a,
#nav-topbar .nav li.current-post-parent > a { color: red; }

should change all your top-menu hovers to red (use any hex color that suits you).
Still don’t understand “but enabling or disabling is not working” – I see you have empty child theme “hueman-child-master” folder.
Above under 2 – instructions on WP child theme creating.