This will show you how to change the size of the navbar buttons.

Go to Display>Colors>CSS.

Insert this code,

Code:

#i_icon_mini_n {
width: xpx;
height: ypx;
}

Replace n with these following things,

Home/Forum - index
Search - search
Members - members
Calendar - calendar
FAQ - faq
Usergroups - groups
Profile - profile
Inbox - message
New Message - new_message
Logout - logout
Register - register
Log In - login