Create a Child Theme
A child theme is a great way to make customizations to FavePersonal that will be preserved when you upgrade.
Creating a child theme for FavePersonal is quick and easy. Just create a new directory in the wp-content/themes directory and add the two following files (style.css and functions.php) as starting points.
For further reference, WordPress.org has an easy to follow step by step tutorial. The tutorial contains further explanations on what each line of code is used for and provides helpful tips when creating a child theme.
If you want, you can also download a child theme with your selected Colors included.