6) Update all external plugins to ensure they are HTTPS compliant (sharaholic, twitter, facebook, youtube, ubb custom-tags, and, if your website contains non-UBB.threads content, all those internal site links - trust me you won't find them all in a single pass)

In layman's terms, how is this achieved? I just noticed I can't see embedded YouTube videos using the Insert Media Tag method... My SSL Report is Grade A.