You can monitor Twitter using two ways. You can monitor a single users. This video will show you how to monitor a single user. Please don't forget that you can also directly monitor the author of a tweet when you save it.
Copy the url of the user you wish to monitor.
Go back to Dashub. Click on Media Deck. Select (or create first) the channel. Click on its wifi icon next to the dop down menu 'sources'.
A window will appear. Paste the url in to the input field.
The source will appear Automatically (don't press enter) once you have pasted the url.
Don't forget to check the name and then click on save.
To see if it has been correctly saved, click on the "sources" dropdown menu. You will see the twitter user in the listing.