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After having created the admindb and harvestdb databases you can install Netarchivesuite using the same procedure as with derby but using a deploy-script adapted to postgresql, viz. https://raw.githubusercontent.com/netarchivesuite/netarchivesuite/master/deploy/distribution/src/main/resources/examples/deploy_standalone_example_postgresql.xml instead of https://raw.githubusercontent.com/netarchivesuite/netarchivesuite/master/deploy/distribution/src/main/resources/examples/deploy_standalone_example.xml
Note that the docker-compose version of Quickstart uses postgresql.