There is a wiki here : ✏ How to gather logs
In a summary:
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[on FP2] you need to go to settings -> developer settings and enable USB debugging. (If you can’t see the menu for developer settings, you need to go to settings -> about phone and tap a few times on the build number.)
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[on your computer] Install the drivers and Android Debug Bridge. For windows follow this tutorial, for linux
sudo apt install android-tools-adb
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[once your FP2 is connected to your computer] Check that the computer detect the device:
adb devices
; then open the log:adb logcat