To do the Tree Gnome Village quest you need to go to the maze of trees below Ardougne and find your way through the maze. But then you find the king and talk to him. Next you have to talk to Commander Montai who will ask you to get 6 logs. After giving him the logs you will be required to find three tracking gnomes.
One of the gnomes is in a cage inside a building in the northeast part of the camp. He will tell you the y-coordinate. Then head west untill you find the next gnome. He will tell you the height. Finally, go south around the outskirts of the camp and you'll find a last gnome. He will give you a riddle that you have to figure out to get the x-coordinate. Go ballista and enter what you've learned. Then go to the main building and climb over the broken wall. Make sure you have full run energy as you will need to get by two level 48 Khazard Commanders. On the second floor of chest and search it to get the first orb. Speak to the King again to learn that a Khazard Warlord has taken the other two orbs. Go to the West Ardougne wall and follow it northeast past level 64 wolves. Make sure you have a lot of runes, food, arrows, or level 43 prayer. He is a relatively easy foe to kill as he will not leave a certain area. After killing him go speak to the King and you'll have finished the quest. You will then be allowed to use the spirit tree network.