I just want guests to see the forum but not to access. In my forum guests can access

   or can not access but can not see the forum. Settings ghests  could not view  in some
forum is just like the forum is missing. Hoping everyone can see the forum but only the
members could access in. What should I do?

Oh my GOD, sorry but It's hard for me to understand what you said.
Are you talking about guest permission? If so, you can set it generally or per forum. See the forum setting (at the bottom) and give guests what access right you want. (Admin CP => Forum => Edit (of the forum you want) => see the bottom => select the access right for guest (as you wish) )

Thank you for your answer. You did not understand what I said. I just want guests to see  

the forum's title and can't enter without login.  (Admin CP => Forum => Edit (of the forum you want) => see the bottom => select the access right for guest (as you wish) ), but
guests could not see the forum title after that. Without log-in no one knows there exist a
forum there.

For example :  

                     Titlle 1
                     Tittle2
                     Tittle3

In my forum ghest only see

                                 Tittle 1
                                  Titlle 3

                   Tittle 2  is vanished

Sorry, but really don't understand what you said   just guess.
Ok, do you mean that something like this:
        forum A can be seen by guest, but when he/she click on, it requires sign in?
or     forum A can be seen by guest, posts' titles are also can be seen, but when he/she want click on the post, it will require sign in?

If you want the 1st one, just edit your forum access settings. If you want the 2nd one, sorry, can't. (I can't)

ok.
check this thread first pls: http://support.forumgogo.com/thread-1249-1-1.html
if you want cant view the forum. just choose yes.
can, choose no.  

PS: check the rules first. thx.
      http://support.forumgogo.com/thread-1389-1-1.html

Thank you. It is 　solved