Note. The question and this answer apply to the Juno version based on LightTable. The current version is based on Atom and has an interactive console.
You cannot enter commands in the console in Juno - to display the output. Commands can be sent from the editor by placing the cursor in the line for sending and pressing Ctrl + Enter or Shift + Enter . Then the value will be displayed in a small pop-up window next to the line, and the output will be printed on the console if you see the console.
Please note that the inability to use the console as you wish is by design. See here for console information from Juno docs.
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