Do We Have Root For ATT Note Edge?
You can get permanent root by doing these steps:

Step 1: Once you have temporary root, download a custom recovery and install it because you will be flashing a SuperUser app along with the binaries.

Step 2: Download SuperSu from this link: https://download.chainfire.eu/696/supersu/

Step 3: If can't find any custom recoveries that support your device, then use the  FlashFire app from the Play Store to flash the zip.

Step 4: Reboot into CUSTOM recovery and flash/install the zip.

Step 5: Congratulations!! You now have FULL root access instead of temporary root!

If you are confused or don't understand something, let me know! :)