Singer 299 keyhole buttonhole machine

Threading the underside looper

[@eduardomendoza2756]

Hola de donde eres,soy de peru.
Una maquina asi esta trabada.

[@aakashfashion8308]

How to looper setting

[@albaneforleather]

I no longer have that machine.
Just like any needle and looper relationship the point of the looper needs to cross through the scarf just above the eye.