This plugin adds an accessible Twitter feed widget, compliant with WCAG 2, requires PHP5.
You can install WP Accessible Twitter Feed using the built in WordPress plugin installer by uploading the .zip file. If you download WP Accessible Twitter Feed manually, make sure it is uploaded to /wp-content/plugins/.
Activate the WP Accessible Twitter Feed in the "Plugins" admin panel using the "Activate" link. Setting are included in the widget.
The Twitter feed authorization can be set in the menu item Setting -> Twitter Feed Auth.
How to get the authorization Keys and Access Tokens: