Hey @Monfed, I just realised I wrote this message and never sent it!
globals branch needs to exist prior to sending from GH, so you need to go to the stream URL and created
Once that’s done, you can send to globals just like any other branch:
That being said, the globals viewer in the frontend is not really prepared to deal with the specific data structures of any given application (Grasshopper DataTrees in this case), so you won’t be able to view that data in the web editor properly yet, as it was designed to edit simple structures where properties have a single value (not a list).
It will though, be available to be received anywhere else (including back in GH).
As for your last question, just use the globals url as in the images 
Just copy pasted it from my browser