Dash & Dot are fully charged when the power button turns off.
Connect by opening app, turning on robot, selecting the plus + button at top right, and choosing your desired robot
If you have several robots in your classroom, be sure to rename them and label them appropriately so they are easy to identify when trying to connect. To rename your robot, connect to your robot via Blockly (see above).
Once connected you can rename your robot by clicking on upper right robot icon.
Select settings under the robot image, and type in new name.