Can't use – TwitBird free for Twitter Review

Can't figure out what this pin thing is and where to get it. I'm so confused and frustrated. Over the years I've signed up for twitter 3 different times thinking that maybe this time I'll figure out what it is about. It usually ends in me being frustrated and 2 weeks later deleting my account. This time I thought I'd try an app to help me with it an still frustrated and can't find help on developers website. I don't know that I want to purchase a premium twitter app if I can't figure this out.
Review by c wempe on TwitBird free for Twitter.