I do!
I invited him to join... But he hasn't yet posted on New Recruits!
Only few posts here and there on open discussions!
I guess it does us no harm to have our "marks" on him so everyone will see the forum link for example... And he's free to post on New Recruits whenever he wants!
P.S. You may PM him there if you want about joining... But I think it's not that he hasn't understand the "how to"