Here is the video that should explain how you can use Looking Glass in your current project:
For now you can develop a code snippet, recording your steps, looking up elements etc. After you are done you copy the snippet back to your code.
I'm currently working on version 3.0 which would allow you to have your whole selenium project in Looking Glass. It will be a big update so it'd be some time before it's done, so stay tuned.
Dmitri