Yes, you can log in from as many different computers and browsers as you like. If it is a browser or computer you have not already added extra security to, you will be asked to validate with the one time security code by phone or text so we can verify that it’s really you. When the security code is entered, you will have the option to add extra security by choosing "Yes, register my private computer." Choosing this will avoid you being asked for a validation code again.