[Theme Horse Support Team]

Hi Pip.partridge,
To change the hover color and also selected highlight color for the primary menu text
Go to Appearance -> Customize -> Ambition theme options -> Custom CSS paste the below CSS code and Click on Save & Publish button at the top of the options panel.

.main-navigation a:hover,
.main-navigation ul li.current-menu-item a,
.main-navigation ul li.current_page_ancestor a,
.main-navigation ul li.current-menu-ancestor a,
.main-navigation ul li.current_page_item a,
.main-navigation ul li:hover > a,
.main-navigation ul li ul li a:hover,
.main-navigation ul li ul li:hover > a,
.main-navigation ul li.current-menu-item ul li a:hover {
	color: #89a452;
}

Note: Please change above HEX color code #89a452 to your own HEX color code to change the color of the primary menu.

Also, If you upgrade the theme to pro version then you can set the color skin of each section with your own color also with lots of features.
Pro version will be available very soon.

Thank you for using our theme.