Alright so Im a lvl 15 Nightelf Druid trying to complete the lessons anew quest but whenever I try to talk to Dendrite I attack him what do I need to do to complete the quest

Hit the U key.

Scroll down to Cenarion Circle.

Make sure the "At War" box is unchecked.

Now how do I use a teleportation stone

Teleportation stone = teleport to moonglade?

This is a spell in your spellbook under the talents section.

A druid should never be at war with cenarion circle. We start at neutral i think. Could be wrong on this though