Removing Date, Author, Category, etc

If your theme has a built-in custom CSS option, use it; otherwise, get a custom CSS plugin and put:

.entry-meta {
	display: none;
}

It’s not recommended to edit your theme’s stylesheet directly, as you’ll lose those changes if the theme is ever updated in the future, to fix security issues or bugs or to add new features. It’s better to use a custom CSS plugin or your theme’s built-in custom CSS option, if one exists.

I don’t see the code anywhere on your site. Are you using a caching plugin or is your host caching your site? Have you tried force-refreshing your browser (see your browser’s documentation)?

Since you’ve changed themes, you’ll need different CSS. Try this:

.post-time-2 {
	display: none;
}

.meta-container {
	display: none;
}