Hi
1. I’m not sure what you have changed, I checked the source code of your page, guess that you haven’t set the navigation with the custom menu? Just go to “Appearance > menus”, create a custom menu for the primary side menu.
2. Yes, but you need to add some custom CSS, however, the customization work is not include in the support service.
General idea:
.primary-navigation ul li#menu-item-214 a{color:#f00;}
.primary-navigation ul li#menu-item-215 a{color:#000;}
You should replace 214 to the actual menu ID. If you don’t know much about CSS knowledge, I suggest you can hire a freelancer web developer to help you.
Thanks