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How do I write the URL to my CSS file inside the wp_css() function?

All URLs must be relative to your current theme. So for example:

If your current theme was the default and you had forms.css file inside folder called css. You would write the following

<link rel="stylesheet" href="<?php wp_css('forms.css'); ?>" type="text/css" media="screen" />

Can I suggest an feature for the plugin?

Of course, visit WP CSS Home Page

Are you available for hire?

Yes I am, visit my services page to find out more.