How do I find out on the web site how many total points I have earned to apply to my life time platinum status?
I found my total nights but not the accumulated total of points.
There is another thread on this topic, but in a nutshell, the lifetime balance is definitely tricky to find. What worked for me was logging in to my account, then clicking on the menu on the top left side of the page, then selecting Marriott Rewards and then Marriott Rewards Overview. You may have to log in again, even though you just logged in 30 seconds before, but then you'll see your current Status, Points and Nights across the top-center of the screen. If you click on the word 'NIGHTS', (not POINTS, which would make more sense) you should get the pop-up window that lists all your stats, including your lifetime nights and points at the bottom.
Retrieving data ...