Your user name and password information is handled outside of Terasender itself. You are free to delete your account on this Terasender installation which will remove all of your files, all the guests that you have invited, and any other debug information you might have sent to the server (failed upload, etc). Deleting your user account with Terasender removes all of this information and Terasender will no longer retain this information. Because Terasender does not have authority over your user name and password, they will remain active until you delete them from your institution.