I've picked up some polar pro filters for the phantom standard. There really aren't any installation instructions. From what I've seen online the adv/pro models have removable lens caps but I don't see any indication of that on my standard.
If it's the same lens cover as the Pro/Adv it'lol unscrew anti-clockwise. Mine was tough to crack the first time, make sure you hold the camera body quite tight when you undo as it'lol take some to unscrew the cover...