How-to :
You create the Ancient Bench and use it to craft the stargate and ZPM (Zero point module, its used to power the stargate)
You place the stargate and rename it (it will be used in the widget history)
/!\ READ READ :
You open the stargate inventory and put the ZPM in the trophy item slot (extreme right of the inventory panel).
SHIELD: The optional shield go into the costume slot, when active, shield will kill any traveler coming into your gate, you must disable it (when you are connected to your gate, use the radial menu to disable the remote shield).
In order to teleport big dinos, you must have enough room in front of the gate.

Admins can place Public Stargates, they dont require power (ZPM), dont take damages and they dont store history calls.

Teleporter rings : Place 1 teleporter on ground floor and another one on a ceiling (but at 5 ceilings max around the first) and it will act as an elevator/teleporter. When you walk on it, it checks for another teleporter into a cylinder (collision box) of 10 foundations large (second check is 50 large) and a very far distance up and down. It should work from ground to floating island.
You can force link 2 rings, by rename them with the same name. They will always connect each other since the distance is handled (max 50 foundations horizontally, almost infinite vertically).
Admins can place public rings (no damage, not locked).

Stargate on Saddle : you should place the gate on foundations. Seems to be buggy on raft.

How to go to temple :
You will need to craft the rune in the ancient bench (3 artifacts, any)
Go into the temple with those items : Stargate Zpm (the lost temple stargate zpm is empty) and a Jumper ZPM. Test room resets randomly after 30-60 minutes.
Good luck.

Jumper controls : Right click => stargate remote, Space => Elevate, C => Lower, X => Land (when close to ground), Shift => Speed. Ark passengers seats, doesnt let me allow you to go third person, but you can go 3rd before taking the seat. Jumper provide oxygen, hyper and hypo thermal protection. Jumper need Jumper ZPM to regain energy.