problem with connecting to postgresql server

Hi
I am a novice in using postgresql and I've faced to a
problem at the beginning of my work....

I have Linux OS on my computer and it has postgresql
server but I cant use it...whenever I want to make a
table
it says that "it can not connect to the server" and it
seems it's because no user has an ID on this server...
how can I make my server work?

thnx in advance

 Novice....

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