The lock icon is referenced in the "#clientLogin" ID of the "theme.css" file (/assets/default/css/), at or near Line 681.To remove the lock icon, comment-out or remove the "background: url..." line of code in the "theme.css" file.#clientLogin { ... background: url('../images/lock.png?1319655200') 95% 50% no-repeat #f6f6f6;}