please guys help me about AT&T D850 30K

Hi
Guys please help me..
I have AT&T D850 30K
Android 6.0 Marshmallow.

How can I Root D850 30k?
How can I enable Hotspot? Hotspot not working on D850 30k.

How can I install twrp with boot unlocked on D850 30k?
Please help me guys I need your help..

from xda-developers http://ift.tt/2aSazyr
via IFTTT