This CSS

#mainnav ul li.menu-item-65 {
color: #012242;

you can add your color code here

}

If you want to change color on hover, then you should add this below css

#mainnav ul li.menu-item-65 :hover {
color: #d65050;
}

To add css

• If your theme has a custom CSS option, use that to add the CSS shown above.

Learn to use the Chrome Developer Tools to help you see and text changes to your CSS.

#mainnav ul .menu-item-65 a{
    color: green;
}

Thought the color green would be nice but it blends in with the background too much, so I turned it to orange, which was fine until the user is scrolling down. An orange menubar is appears then so now the ‘doneer’ button is olmost invisible. Is there any change to change this color when the user has scrolled down?