How to edit Free Theme nopcommerce?

I have download Wrist wear Theme From marketplace but i hove some questions
i want to edit the colors of theme
and i want to make the Menu bar on Line not Line like the theme
i have some basic CSS can help me  which files i should edit change the theme
waiting for help

you can inspect css from browser and search by class name at theme css files. every theme should contain css files at this path src\Presentation\Nop.Web\Themes\{YourTheme}\Content\css
or your can take theme owner help for minor changes

Thank you .this help too much
i found two things i can not remove from Adminpanel or theme files
First is this Message

Welcome to our store
Online shopping is the process consumers go through to purchase products or services over the Internet. You can edit this in the admin site.
If you have questions, see the Documentation, or post in the Forums at nopCommerce.com

Second this block (newsletter)

can you help to remove this

Crispo wrote:
edit HomePage topic body

Crispo wrote:
delete this block from src\Presentation\Nop.Web\Views\Shared\Components\Footer\Default.cshtml

thank you for help i modified my theme but i have little bit problem when try to add product or add whishlist its keeps loading in the theme with no ending , how can i fix this

Check is there any error:
1. From inspact browser console
2. From admin - > system - > log