Arduino Yún Manual page 12

On the new page, you will configure your Yún, giving it a unique name and identifying what
network you want to connect to.
In the Yún NAME field, give your Arduino a unique name. You'll use this to refer to it in the
future.
Choose a password of 8 or more characters for your Arduino. If you leave this field blank, the
system retains the default password of
arduino
If you wish, you can set the timezone and country. It is recommended to set these options as it
may help connecting to local WiFi networks. Setting the local timezone also selects the country's
regulatory domain.
Enter the name of the wiFi network you wish to connect to.
Select the security type, and enter the password.