1. Pick season of player you want in a "util" spot, and add him to your roster.
2. Copy the web address, it will look something like this:
The last bunch of digits is that player's unique season ID. The " add&spot=15" is where that unique player season is on your roster
1=C, 2=1b, 3=2b, 4=3b, 5=ss, 6,7,8=of....
3. Delete said player from your roster.
4. Paste the link that you copied in step two into your browser.
5. Change the number in " add&spot=xx " to where on your roster you want the player to go, then type " enter"
6. Go find your next player, rinse and repeat