Background
Laptop hostname: jlap user: Admin
to
PC hostname: ahost user: jackp
both on the same wifi network
KopiaUI is running fine on PC snapshots scheduled
from C:\Users\jackp to E:\backups locally.
I would like to run KopiaUI on jlap C:\Users\Admin to the Kopia Repository Server on PC or another Kopia repository on PC.
Connectivity
The connectivity from laptop is such I can see the PC hostname under Network in Explorer and I have logged on with PC credentials and see \AHOST\Users\jackp folder and another disk F: on the AHOST
Does this mean I have the required connectivity ?
Attempt
Now on the laptop I choose connect to Kopia Repository Server.
I am prompted for server address so I enter
https://ahost:51515
A second field says enter truster server certificate fingerprint at server startup
The server Repository page lists encryption/hash/splitter algorithms and connected as jackp@ahost but I don’t see any server certificate fingerprint mentioned.
What is this certificate fingerprint ? where would I find it ? Have I missed any steps ?
I then tried leaving it blank (should I be able to?)
I was asked for Server Password and it tries to connect as Admin@jlap (laptop credentials) and its asking for Repository Description.
Is it wanting to create a new repository on the server or need to connect to an existing one ?
I tried putting in the name of existing repository on server Jacky but Unavailable desc - name resolver error produced zero addresses
Help Please 
Please let me know if what I am trying should be possible and any pointers to diagnose what’s stopping it working.
Am I missing some pre-requisite tasks ?