Use the USB port on the end of the battery. You know it is charged when all 4 green lights are lit. Charge your battery BEFORE you put your robot together because it's not easily accessible by that point and you can end up trying to charge the brain (which won't work without the battery!! ).
Watch how to pair the robot to the controller. Use Use the step-by-step guide for how to connect the chrome app to the brain on the robot or use the tutorial also posted below which gives quite a few tips on using the app that you will need to know (skip ahead to 1:45 if you're feeling impatient).
When the Brain icon is green you know you're connected.
You need to hook up your motors on the right hand side of the extension before you can see the move codes.
You need to save your project under file before you can play it.
To play (make the bot move) your code, you need to press the download button.
If you have more than two drive motors, you need to add them as "motors" when you added them in tip #2. They get added to one block that will have a dropdown menu if you added more than one.
More added soon! Keep checking back!