Need Help changing color and fonts

I understand that to you guys and other web designers these instructions are easy. As a person who is simply running wordpress and doing basic codes, it is very difficult. This is all I found so far to help my issue:

Customize fonts for a menu item title and description:

.wprmm_menu .menu_category h3{
font-size:24px !important;
font-family: Times,Georgia,Serif !important;
}

.wprmm_menu .menu_category p{
font-size:12px !important;
}

The link to this advice is here: https://www.sailabs.co/products/easy-restaurant-menu-manager-wordpress/custom-fonts-using-css/

This is way too vague. I know where to put this entry, but as to which titles and descriptions get customized, and what color I want them to be, is not stated, at least not clearly enough. For example, I have 1 of my menu’s titled Appetizers. Then I have 2 categories which are Soups and Salads. Then I have the items, like Clam Chowder for soups and Caesar Salad for salads. I want each title to be a bright green and the description to be a glossy-like black. How is this done? Where in that example code do I put the codes for color? Where in the example code do I put “Appetizers” and “Salads” to turn out bright green? I would appreciate some help or input.

https://www.ads-software.com/plugins/easy-restaurant-menu-manager/