pgAdmin - Post installation question/s ?

Running Kubuntu 24.04 and needing to maintain a PostGreSQL database.
Wanting to use pgAdmin and possibly some Python code to maintain the
database.

I have downloaded and installed the APT version from
https://www.pgadmin.org/download/pgadmin-4-apt/

Keep getting stuck on the Register Server | Connection
- Unable to connect to server. connection failed. connection to a
server at "127.0.0.1":port 5432 failed"

Is this just a firewall related error ? I have looked through various
guides and cannot find one that is a 'post install' based.

Peter

--
Peter Richards
-- -- -- -- -- -- --

There’s not something etched in stone that must be achieved in order
for healing to occur, except complete and unconditional
self-acceptance.- Yeshua - Way of Mastery