Studio supports auto recognizing of the language you're between those supported: SQL and Gremlin. While writing use the auto-complete feature by pressing CTRL + SPACE.
To execute the query press the EXECUTE button or don't move your hands from the keyboard by pressing CTRL + ENTER combination.
By clicking the table row you go in record edit mode.
Studio speaks with OrientDB Server using HTTP/RESt+JSON protocol. To see the output in JSON format press the Output tab.