Navigation Bar Rights access Problem

Hi.. i've got some silly problems since i started using this forum, . my forum address pfmc.friendhood.net.
somehow i can't change the user Rights access on the navigation bar.
normally, i got to Display- Nav bar- Navlinks.
i tried to change the authorization for most of the members, except login, index and so on off course. But when im in the menu edition panel -to change Rights- all ive got is the default Rights box with grey highligted , and i can't change it with any actions. do i make it wrong, or somehow there is other way to change the rights ? cause i like to change the nav bar looks for guest at the first time they look at the forum -in fact i want to hide he gallery nav bar only for registered members-. And also i want to change most of the nav bar- such as: members , groups nav bar- only for admin eyes only.
Can you people help me to sort these things out?
Thank you for your extra support.

Hellooo ???

Admin panel
Users & Groups
Special Rights

That is where you set them.

Yup already done that. I've only got
-search
-faq
-calendars
-members
-group
and Board of statistic

but how about, "gallery" is it always set open to guest, cause i like to only members of the forum who can see it. the default is "all" authorizations , and i cant change it. All the Rights already been ticked box -grey highllighted- and i cant do anything. so what is the purpose of having the nav links menu, if i cant modify it all, except if i make a new nav bar -Rearrange the position is working fine-. the only choice i have -as an administrator- is a tick box for opening a new window for each nav?
thx for replying... but still unsolved for me

This is what I did/do.

Create a new navagation in Headers

Place the gallery image there as well as the link. Set it so only members can view.

Now go back to the Pics management and delete the link to the gallery that is there. Click save.

Now go back to headers, and move the original gallery link all the way to the bottom, and move the new gallery link (the one you just made) to the place you had the original

save.

Just as i thought ... l'll try in a couple of minutes 'bout your advice. At first i'm bit afraid if i'll do that, it will ruin all the program of the nav links.. i hope it's save. hehe..
I'll let you know about the result...
many thanks for the advice..

you know what... before doin' all about your advice...my forum gone "White" again just like yesterday.... this is the 3rd times...
well i have to wait then... and report to the the tech staff...