here are the instructions from the season 3 thread:
First I searched for the ARod I wanted. Then, I rightclicked on his name (Not the green arrow). Then I selected "Properties". Then I copied the unique player number. This is the first number after the parentheses, and was something like 2244050 for the 2009 ARod. Then I went to catcher, or whatever other position I needed to fill, and selected a player - any player, it doesn't matter which one. Now, once selected, on the draft page in the URL box is a bunch of numbers, but the last number is the unique player number for the guy I just drafted. So I went to the URL box, highlighted that number, and pasted ARod's number in its place (2244050, or whatever one I needed). Press Enter and voila.