Genesis Theme

Hey guys, so I am very new to wordpress and I am not a tech person. I have run into some problems regarding the layout of my website.

my site: lingsgifts.com
1. I want to change the color purple into orange
2. make the navigation font bigger and darker
3. Also I would like to customize my site title and make it in the middle of homepage.
4. make the bottom “support by genesis” change into made by lingsgifts, something like that.

I don’t want to touch the php file because I dont know how. I will learn how to do it if I have to. I want to customize the css if its possible. Can anyone plz help me out 🙂
Thanks