Trouble adding a CSS link in Wordpress

Thanks, that's a start...

But you're dealing with a real dunderhead. How do I code the "FILE"?

Check in your theme wp-content/YOUR THEME folder if you already have a functions.php file. If not then you can create one in Sublime Text or any text editor you are using and add your code and save it as functions.php

I guess I misunderstood your above question, here what you will replace plugins_url('style.css', FILE) with

function safely_add_stylesheet() {
    wp_enqueue_scripts( 'prefix-style', 'style.css', get_template_directory_uri().'/roll.css');
}

Thanks! I really appreciate your help! That is exactly what I needed.

Hmm... so I added that below code into my functions.php, and it didn't take.

function safely_add_stylesheet() {
wp_enqueue_scripts( 'prefix-style', 'style.css', get_template_directory_uri().'/roll.css');
}

Any idea what went wrong?

Oh Duh! I should've figured that out. Thanks!

Ok. I added the code below to my functions.php, and got a 500 internal error.

function safely_add_stylesheet() {
wp_enqueue_scripts( 'prefix-style', 'style.css', get_template_directory_uri().'/roll.css');
}
add_action( 'wp_enqueue_scripts', 'safely_add_stylesheet' );

So I changed it to this:

function safely_add_stylesheet() {
wp_enqueue_scripts( 'prefix-style', 'style.css', get_template_directory_uri().'/roll.css');
}
add_action( 'wp_enqueue_scripts', 'safely_add_stylesheet()' );

and I got this reply: Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'safely_add_stylesheet()' was given in /home/andrew/public_html/mbtlive/wp-includes/plugin.php on line 406

My bad I didn't noticed the 'style.css' you had try the below code:

function safely_add_stylesheet() {
    wp_enqueue_scripts( 'prefix-style', get_template_directory_uri().'/roll.css');
}
add_action( 'wp_enqueue_scripts', 'safely_add_stylesheet' );

I'm still getting that internal error. :(

P.S. Thanks for the help. I'm out of my depth here. I've kept trying to avoid using an extra stylesheet, but at this point its become pivotal.

Well it takes few more things to make it work.

1. Your header.php file must have wp_head(); before the </head>
2. You should still have a style.css included to your theme with the comments about the theme name etc.

I've checked both of those.

When I use this script, I get an internal error 500 message over the whole front end of my site.

function safely_add_stylesheet() {
wp_enqueue_scripts( 'prefix-style', get_template_directory_uri().'/roll.css');
}
add_action( 'wp_enqueue_scripts', 'safely_add_stylesheet' );

Any other ideas?

It's a make an error day for me, There was another problem with it try the below code

function safely_add_stylesheet() {
    wp_enqueue_script( 'prefix-style', get_template_directory_uri().'/roll.css');
}
add_action( 'wp_enqueue_script', 'safely_add_stylesheet' );

the function is wp_enqueue_script not scripts .

That took care of the internal error! (Nice catch)

However, now the page is no different, no matter the css I write in the roll.css (I.E. I'm pretty sure the stylesheet isn't making it all the way to the page.)

Do I need to put the wp_enqueue_script() hook somewhere?

What would that look like?

try view source in browser to see if the file is included properly. Also if you are overwriting any styles from another file then it should be included after that file.