copied from the "Frequently asked questions" thread

1) Draft the player you want in any other roster spot. When you do so, you will return to the draft center.
2) Copy your web page address.
3) Delete the player you just drafted.
4) Paste the address you just copied in step 2 into your browser, but do not type [enter]. The web adress you just copied and pasted will end in something like this spot=4&playerid=1234567. The last seven digits are associated with a particulat player; the number after "spot=" corespond to a roster spot.
5) Edit the web adress by changing the number after "spot=" to the number of the position you desire.
6) Type [enter] and the player you drafted in step 1 should appear as your catcher.

For example, if you wanted to draft 2011 Placido Polanco in your catcher spot, your could draft him as thirdbaseman and copy from your browser this address:
http://www.whatifsports.com/mlb-l/themewiz_buildteam.asp?action=add&spot=4&playerid=1853995

After deleting him, paste that same address into your browser editing the number after spot= from 4 to 1:
http://www.whatifsports.com/mlb-l/themewiz_buildteam.asp?action=add&spot=1&playerid=1853995.
Hit enter and 2011 Polanco is now in your catcher spot.