hey I would like to know if it is possible to join melee legit dueling in any way, Ive got a friend that is interested but he doesnt know where to go or post to sign up

Ive seen there's a "legit dueling" subforum but might as well ask here if someone knows how to join these thanks

Yo going to Legit dueling subforum is the best way to find out.
This is the current melee gm ladder - ask there:
https://forums.d2jsp.org/topic.php?t=104457971&f=147