[twobob]

Transfer the generated file (dict.mobi) to the documents folder on your Kindle
Press Menu
Select Settings
Press Menu again
Select Change Primary Dictionary
Select your new dictionary

no? not work?

and:

If this is the only dictionary you have for this language you’re now done. If you have multiple dictionaries continue:

Press the menu key on your Kindle.
Select Settings.
Select edit next to Dictionaries on the second page.
Select the language you wish to set the dictionary for.
Select your new dictionary from the list.