There is more than one way to add Twitter to your website.
In this section, we will detail how to add a twitter feed to your website as a RAW HTML Code.
Alternately, To add a 'Twitter Widget', please see the alternate How To section Titled 'Adding Widgets' which will show you how to add a Twitter Widget to your site, and also some other widgets.
Both options behave slightly differently, one may suit your needs better so why not try them both.