How can I assign the menu "disclaimer" to another position in the design?

Use the area Tools & Administration > Design & Layout > Applications Link/Menu Locations and assign the chosen menus e.g. to the Design Modul "Applikation Links".

Note: The menu has to be added as a main menu before. Furthermore you can link the placeholder <a href="$linkMenu:ID">Disclaimer</a> directly to a menu or a story in the in the MasterDesign. But this is not recommended when using multi languages.