To withdraw from an account some amount of money click on Tools >Withdrawal.

Select account name for withdrawal and Withdrawal amount using scroll box or input box. Press Execute. The confirmation message about blocking withdrawal amount will appear.

When broker withdraw money from your account, you will see the message about it.

Note, that sum of Withdrawal amount and Left for withdrawal is equal to Available for withdrawal.

It's better to confirm your broker, that you want to withdraw money from an account and you made withdrawal operation.