Anyone familiar with Postgres

I am having a serious newbie problem trying to setup Postgres.

I am trying to create a new server on localhost:5555 using pgAdmin4
But it keep giving me this error which doesn’t tell me anything.

Unable to connect to server:

could not connect to server: Connection refused (0x0000274D/10061)
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5555?
could not connect to server: Connection refused (0x0000274D/10061)
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5555?

I have searched on Google for hours.
I think there is something else that is going on that I am not aware of.