Follow these steps:
(1) Download and activate Twitter for WordPress by Ricardo González https://rick.jinlabs.com/code/twitter
(2) Upload the plugin to your plugins directory in your wordpress installation.
(3) Activate the plug-ins.
(4) To use “Twitter for WordPress” with your account, log into your
Wordpress ADMIN PANEL and select: Appearance & Editor ? Sidebar (sidebar.php)
(5) Replace all 3 appearances of “cordobo” with your username on twitter.
Then it’s important that you don’t add any widget to module 1 of the sidebar, otherwise the Twitter and Suscribe feature won’t show.
Good luck!