A Simple Twitter widget for your sidebars. No passwords and is customisable!
To use this widget in the WordPress dashboard, go to Plugins -> Add New -> Upload, and choose the zip file that you downloaded here.
Activate the plugin from the Administration Dashboard.
Open the Widgets page (wp-admin/widgets.php) under the Appearance section. Appearance -> Widgets.
Drag the Simple Biz Twitter widget to the active sidebar, input your information and Save changes.