Hit
Alt + R and then go to the tab called
Popups. There you can find them. You have 5 kinds of popups: Channel, Status, Nicklist, Query and Menubar - you can pretty much figure where these popups go by their names

The
Menubar one appears in the Toolbar, between the
Tools and the
Window menus (in v6.26).
Popups work this way:
Menu.Submenu1: item1.Submenu2..Sub-submenu: item2For each level you add a dot (.) in front of it. You can see some examples in the Popups tab and in
/help popup menusZyzzyx