[Red_Dragon.]

Did you add

pawn Код:

return 1;

under your line ?
Make sure to place the correct parameters

pawn Код:

(text[], color, Float:X, Float:Y, Float:Z, Float:DrawDistance, virtualworld, testLOS)

Example taken off the SAMP wiki

pawn Код:

public OnGameModeInit()
{
    Create3DTextLabel("I'm at the coordinates:\n30.0, 40.0, 50.0", 0x008080FF, 30.0, 40.0, 50.0, 40.0, 0, 0);
    return 1;
}