Hi, steps to get started with an IQ Panel 2/2+ are described here!
The panel IMEI ( the serial number needed to get started ) is found on a sticker on the back of the panel case or under the About section if you can access settings.
Default codes for that panel are 1234 for master user, 2222 for the dealer code, and 1111 for installer. These may have been changed by the installer, but it would be somewhat strange for them to set a different master user code so that is likely still 1234.