This article goes over the Actions that are available for use with Twitter.
Twitter - Instructional Video
Twitter - Tweet
Tweet lets you send out one Tweet each time you press a key.
You can use the Account menu to select the Twitter account you want to Tweet from. You can enter your Twitter account(s) in the Stream Deck Preferences.
You can use the Message field to compose your Tweet.
Please Note: You can only post an identical Tweet once every 12 hours, as per Twitter policy. Therefore, please vary your Tweets.
If you like, you can make a folder in Stream Deck that contains many different Actions - each one with a different Tweet. That way you'll have easy access to all of your common Tweets, and will more easily prevent yourself from posting identical Tweets.
Twitter - Change Name
Change Name lets you change your Twitter display name.
This action does NOT change your Twitter handle.
This action is useful to indicate to your Twitter follows when you are live streaming.