As a subscriber, you can lock your access to a bank. Other subscribers to this bank are not affected thereof. To do so, mark the relevant bank in the overview and choose Lock bank access from the menu More actions. This page will then appear, where you have to confirm the process by clicking on the blue button. After that, the dialog box for entering your password will open.
To reactivate a locked bank access, call up the item Perform initialization in the same menu as above. The rest of the procedure is the same as described in the section Initialization.