HOW DO I ATTACH US05 DECKING FASCIA BOARDS?

You would want to use the third-party tool, the Deckfast Fascia System, featured here: http://www.starbornindustries.com/deckfast-fascia-product. You can color match the boards using their screws by reviewing the right color with their Deck Matcher tool here: http://www.starbornindustries.com/deck-matcher/tool.