Because I'm unsure:

1) Have you done the Astral Travel quest? This requires 40th circle, the moongate spell, and if much easier with the help of a higher level friend who knows how to astral travel.

2) If so, you will need to STUDY the various shards before you can travel between them. Yeah that means you need to travel to each of them before you can use the shortcut. There's two Elanthipedia pages that explain this in more detail:

https://elanthipedia.play.net/Astral_travel - This explains the mechanics behind the system (i.e. what ot do).
https://elanthipedia.play.net/Grazhir - This has a nice chart that covers the approximate skills needed to learn various shards.

I hope this helps!

Nikpack