On selecting Post to Twitter or Show Twitter Timeline for the first time on the individual entry page or in the Web viewer, you will be asked for entering your Twitter username (or email address) and password, then redirected to the Twitter Authentication page.
Note: Occasionally the authentication page would not be available due to some problem such as the temporary overload on Twitter system. If you might get an error, retry after a while.
Scroll down, enter your Twitter
Username or email
and
Password
then tap Go button on the software keyboard or the Allow button within the page.
When the authentication completed, you will see the notification "Connection Allowed", then after the completion message pops up you will be automatically redirected back to the application (See the following two screenshots.)
Note: Make sure to wait until you see the pop-up message as your input could not be saved if the operation got cancelled.