ummmm how do you even use sub forums ?
a hack for it anywhere for 3.5 ?

It's a standard feature of vBulletin. When you create a forum, and choose another forum as parent, it becomes a sub-forum.

That was one of the many features of vbulletin that made me want to purchase it. :) I use subforums extensively.

what's the difference between this and this -> ( https://vborg.vbsupport.ru/showthread.php?t=91299 )

One uses templates, and one uses code. You'll be fine with either one.

ya i know how to create sub forums but how do you make it appear on the forums homepage like that up there

nevermind I didnt read a section up there

I can't get this hack to work..., I feel like an idiot. I followed the directions closely and it seems like the edit to the functions_forumlist.php file causes my site to come up blank.

I see you mention that it COULD be two instances of that code, but I only found one. Is it suppposed to be two?

It's one instance, but there's another close match that tend to confuse people. For this reason I changed the instruction by listing 3 lines block to look for, instead of one line.

How to move this text: Sub-Forums: out?