Originally Posted by Tolkamp
Thank you for your solution.
For me it is still not yet completey clear what to do.
I have copied the friends library to my computer (map name: Calibre library friend).
My own libray is called Calibre library.
You say: "connect to it using the black triangle to the right of the library icon"
I don't understand this sentense, may be you can describe it in others words.
There is a Menu if you click the Black Triangle
The first choice (US English version) is Create/Switch
Use the browse button to Locate the Friends Library