how to you grip/throw a slider from a lefty submarine arm angle, i can throw a rising curve but want to throw how to make a pitch slide across the plate when i pitch against lefties

Guesses*

Instead of getting on top of the ball, or under it actually
have the grip start sideways, you would have to turn your entire forarm though o-0

just like you would a slider for a regular thrower. On the upside down U or horshoe with middle on the lace on the left hand side. I'm not totally sure but I've played around with it righty submarine and it worked.