You need to open players.dbf, located in your MyDocuments/NBA Live/saves/roster folder, with a program like DB Commander or even with excel.
In the players list, search for Jason Kidd and browse through the colums to find the FTRITUAL value (or something like that). Whatever number it is for Kidd, enter the same number for your created player, still in the players.dbf file, and that should do the trick