Launch the game from 1000.

You'll then see:

            Logichess   Version 1.0

   Copyright (C) 1980 by Blue Label Software.

Vil du have hvid? _
The question asked is whether you want white (answer Y or N). Next question is
Tid for 40 traek: _
(Time for 40 moves). Answer with some number (like 10).

At the main screen enter moves as follows: BC5, where B is the name of the piece and C5 is where you want to move it.