You will need to add extra security to each computer that you use for online banking. This can be done easily from the user options page once logged into the online banking. Whenever you login from a computer that you have added extra security to, you will automatically have additional protection, and notice no difference in the way you login. However, if you login from a different computer than the one you have added, you will be asked to supply your answers to the additional security questions in order to validate your identity and login credentials.
Please note: If you use multiple browsers within the same computer, you will need to add extra security to each browser separately.