The figures are entered with the number blocks.
The entered value is shown in the Display (1).
The button < Backspace ←> (2) deletes the character in front of (to the left of) the
current cursor position.
The button <del> (3) enables the deletion of the characters behind (to the right of)
the current cursor position.
With the button <Z> (4) you can shift the current
cursor position by one digit to
the right.
With the button <Y> (5) you can shift the current cursor position by one digit to
the left.
With the button <Return ↵> (6) you can take over the input and the number block
closes.