The first step in getting help is to make sure you have read the documentation and FAQ that came with phpPgAdmin. It is quite likely your question is answered there, so why waste time waiting for a response from someone, check the docs!
Should you not find an answer though, there are other ways to get help.
We recomend posting to the public help forums as your first step in getting help. You will have a better chance of getting help quicker since more eyeballs follow the message forums. Plus this way your question will be archived in an easy to search place (hint hint).
We also have some mailing lists that might be of interest to people.
If your question is PostgreSQL related, rather than being specifically related to phpPgAdmin, then you need to ask your question on one of the PostgreSQL mailing lists.
There is extensive online documentation for the PostgreSQL database.
There is an IRC channel devoted to PostgreSQL on irc.freenode.org - the name of the channel is #phppgadmin, the phpPgAdmin developers can be found there.
Moreover, you'll find a lot of experienced PostgreSQL users on #postgresql as well.