Need help with child theme

I want to change the .bpfb_form_container, and list tabs and What's new text color.
I've got the following from using Firefox - but not certain how and where to insert into child theme.

`.bpfb_form_container {
background-color: #ABABAB;
padding: 1em;

div.item-list-tabs {
background: none repeat scroll 0 0 #9D9D9D;
clear: left;
margin: 25px -19px 20px;
overflow: hidden;

Plus want to change the "What's New, ?" font color to #852929