Take the top 'beauty cover' off first, you will then see a round cover (as Steve said) it's held on with 2 screws and mastic, remove this, its under there. Funily enough i'm just checking my fluid, if you want me to post a couple of pics let me know.
go for it mark pics are always handy i'm off to TCS tomorrow and will be taking pics of underneath my car just for reference or fellow p/headers in the future
mine is not sealed. It is kept in a garage tho, but its also a daily driver. I was thinking of just putting a beed of mastic around the outside of the cover. That way it'll deflect any water and still give easy access for checking levels.