To start your EV3, insert the SD card, insert your Wifi dongle (if you have one) in the USB host socket, and press the dark gray ENTER button.
The first time you do this it will take 2 or 3 minutes to load, as it copies and prepares the Oracle JVM.
If you are using Wifi, you will need to connect to your Wifi access pint. This simplest way to do this is to use the menu program which should now be running.
For full details on using the menu see [Using the Menu System].
To just configure Wifi, press the Right key until you see:
Then press Enter.
You should then see something like: