In Global Navigation, click the Account link [1], then click the Settings link [2].
Click the Twitter button underneath the Other Services heading.
Click the Authorize Twitter Access button. You will be re-directed to Twitter to verify the authorization.
Enter your username [1] and password [2] in the appropriate fields. Click the Authorize app button to connect your Twitter account to Canvas [3].
Twitter will now appear under the Registered Services heading in your Canvas settings.