How am i adding an option to colloseum on NPC

Hello all
i wanna add an option to enter to the colloseum on Lay NPC
how can i do it?
i know that is in character.inc but dont know the code

copy the function from the npc wich now enters collo, pretty simple.

ya i added the command
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AddMenu( MMI_COLOSSEUM_COLOENTER01 );
AddMenu( MMI_COLOSSEUM_COLOENTER02 );
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but now when i try to enter ro the colosseum nothing happand