ProjectArmy

An alternative to the FTP is if you have access to the Editor option under Appearance. You can access and edit the header.php file from there. Just put the code that google gave you before the </head> tag.

Screenshot: http://screencast.com/t/Qxa2SqBifZT

Just to clarify, are you doing all this from your host’s control panel?

What should be the correct url? Have you tried using the functions.php method?

update_option( 'siteurl', 'http://example.com' );
update_option( 'home', 'http://example.com' );

If your site is hosted locally, have you tried using the usual structure like http://localhost/site-folder-name?

Here’s the code:

.header-fill {
	position: fixed;
	z-index: 10;
	left: 0;
	right: 0;
}

Put it in the style.css of your child theme. If you don’t have a child theme, use a plugin that will allow you to add CSS codes to your website.

This might be useful.

Can you please post the url of your site so that we can see?

I think it depends on how well you customized it. Basically, I’d say it still depends on how the website looks no matter what theme is used.

What do you mean by the colors completely change? Can you please post a screenshot?