up near the top left corner of the league home page, next to the draft info, there's a box that has some text in it. One of the things says "pre-rank players."
i've never preranked before, but it should be self explanatory on how to do it.
"[He's] a really complete player... There's not really any weaknesses to his game." - Bill Belichick on Andrew Luck
"Vontae Davis looks like Bumgarner of the San Francisco Giants. He's throwing a no hitter out there tonight" - Jon Gruden