Use the Scripter tool provided by the i68Controller.
// From i68Scripter Template
// Sets a specific value for any field in the players table
// Usages:
// SetGenericPlayersTableValue (playerid, columnname, value)
// SetGenericPlayersTableValue (playername, columnname, value)
// Notes:
// Since this is a generic command, cannot make any preventive
// check on the range and on the type of data entered.
// Improper use may corrupt your database copy.
// Examples:
// SetGenericPlayersTableValue (Pogba.Paul, potential, 89)
// This sets a more realistic potential for Paul Pogba which will never be as Messi...
// SetGenericPlayersTableValue (1179, gkreflexes, 89)
// This enhances reflexes for Gigi Buffon which is still a cat!
So:
SetGenericPlayersTableValue (Nainggolan.Radja, bodytypecode, yourvalue)
Easy.