Doubts in connectivity

Hi,

I have installed postgres in red hat linux. the
pblm. is i couidn't able to connect from the client
machine which is also running in linux.

i have tried by intiating the postmaster with -i
option but still i coudn't able to connect.

can u clear me the following the doubts

1. how do i connect postgres from a client machine
where postgres is installed and running successfully
in local.
2. how to shutdown the postgres database.
3. how to create user with passwords

Kindly clear me the doubts

With regds

Shiva..

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