How to Import rpm signature

I need help with the following note in the documentation:

Many of the RPMs are signed with the PGP key of the package builder. Directories contain a CURRENT_MAINTAINER file which includes the name/email of the package builder and link to their PGP key. You might want to import the signature before you’ll install the RPM:

rpm –import http://link/to/the/pgp/key

I did a direct download from this location:  http://yum.postgresql.org/9.3/redhat/rhel-6-x86_64/repoview/

What is the correct format for importing the key – I found this example in the documentation:

rpm --import http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6

Thanks …

-mmck-