By default, account balances are shown for all transactions entered in MYBOS. This is generally what you want however once you are using MYBOS for more than single accounting period (e.g. financial year), it's good idea to customize this screen so the profit and loss statement reflects your current accounting period.
Click Set Period button on Summary tab.
Select the period for which you want Summary to show figures.
Click Update button to apply changes.
Summary tab will now show figures for the chosen period.