If you want to load some additional dictionaries, first of all, you need installed MultiDict on your iPhone and follow next instruction:
1. Take the dictionary which you want to load to MultiDict. It will be 2 files: .dict è .idx. The format of dictionaties must be StarDict.
2. Open any file-menager and go to file where there are MultiDict. It could be file with alphameric name on directory /var/mobile/applications. There is Dict.app in necessety folder.
3. Open file Documents (dont open Dict.app)
4. Load the a new dictionary (files with .dict è .idx formats from item 2) in "Documents" folder.
5. Open MultiDict, go to the settings and choose loaded dictionary from list of dictionaries.