The reset button is meant to be pressed for 2 seconds when configuring an IQ. Pressing the reset button for too long will result in a reset of the IQ. Should this happen while it is the first time you have tried to configure network settings on the IQ and it was not added to a Site yet, no action is required. The IQ will simply start up again and you may repeat the process.
If the IQ was already part of a Site and up and running, it will need to be restored. This can be done by a Site admin in the Site, and going to the site > hardware section of the KS web interface.