To interact with any Tweet you view in Plume you will first tap the Tweet to open the Tweet action menu, which will open just below the Tweet that you select. Simply tap the Tweet again to hide the menu.
This menu provides many options for interacting with the Tweet such as: Retweet, Like, Reply, and Share via other apps. You can also scroll side to side within this menu to display more options like View replies to the Tweet, Copy the Tweet text, Direct Message the user, or Mute the user who sent the Tweet.
If the Tweet you select is your own Tweet you will also see the option to delete the Tweet if you wish.