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You can’t edit fields from related models directly in fieldsets.
I suspect you have your foreign key the wrong way round. If you had a FK from Image pointing to Entry, you could use inline admins:
class ImageInlineAdmin(admin.TabularInline):
model = Image
class EntryAdmin(admin.ModelAdmin):
fieldsets = [('File info', {'fields': ['name','password']})]
inlines = ImageInlineAdmin
list_display = ('name', 'mimeType', 'password')
admin.site.register(Entry)
Source:stackexchange.com