Enter a journal entry in the journal panel: the date, the debit account and its amount, the credit account and its amount. The statement is rebuilt the moment you add it, so the balance sheet on the board always matches the entries you have registered. Picking a row in the list puts it back into the fields, where you can correct or remove it.
The display panel switches between the balance sheet and the income statement, and between the table and the figure. The figure stands the debit side and the credit side up as two columns whose heights follow the amounts, so what the statement is made of can be read at a glance. The file panel keeps several projects, saves them as JSON, and exports the statement as an image.