How to add the "Parameters-URL section" to Top Menu titles?

Hi!My problem is that I want to assign a translated article (translated in FlexiContent) to a translated top menu title in joomfish. In some cases I was already able to do this, because when opening the menu title in joomfish translation, there was a section called "parameters-url", in which I could assign the item from flexicontent to the translated menu title. However, not this section is only available in some menu titles...how can I add this parameter-url section to the menu title, or otherwise assign the translated item to the menu title?
I know this question must sound quite complicated, but I hope someone understands what I mean and can give advise...Thanks a lot! Christina