You should be presented with a board representation. You just move the pieces on the board. Touch a piece and touch the square you want to move it to.
I won't say there might not be a bug with your particular device but I have it on my phone and tablet and it works.
No idea how to enter games on this thing.
I made a new DB, and then did new game.
But, I can not enter any new moves.
What a terrible interface.