Proface FP3900 - 19 Flat Panel" - Manual (Page 78)

Chapter 8 Keyboard Operation
8-7
(3) When the [Text Services and Input Languages] dialog box appears, select [Add] in [Installed services].
(4) The [Add input language] dialog box appears. Select the desired language from the [Input language]
combo box.
In [Keyboard layout/IME], select the keyboard layout of the keyboard to be attached and click [OK].