How to add a Twitter widget
Navigate to the piece of content you are wanting your Twitter Profile to appear on.
Place your cursor where you would like the Twitter Profile to appear, and select the Twitter icon in the WYSIWYG toolbar.
A Twitter Properties window will appear. From the Twitter widget type drop-down, select Profile.
Provide the Twitter user name, and then click OK.
Save.
Publish.
Notes:
There are different types of widgets besides the basic Profile, for more information see: How to create different types of twitter widgets.
You cannot create a Twitter widget based on a privatised account.