Removing Navigation Bar

I’m trying to remove the top navigation dark blue bar right under the logo. I also tried changing the color to match the gray bar and it let me in the preview but when I saved it, nothing happened on the actual website.

I’m also trying to add “Cruse Investments” right beside the logo and need a code for that. I prefer using custom css for all of this because anytime I make changes on the template, nothing happens.