Using an external stylesheet css file with weebly

I'm waiting to hear back from weebly about the following css stylesheet issue... My email to weebly support monday may 23rd: I'm trying to remove the main_styles.css sheet from my template ... I updated my custom templates header to use external stylesheets hosted on my other webhost. Now in the weebly design view the external styles are not loaded and I just get unstyled content.