How to subscribe to a pubsub node using OpenFire?

Hello:

we are going to use Openfire in a Server-2-Server setup, so that it can start receiving xml data from another XMPP server which exposes data through pubsub node. I do not see anywhere inside openfire admin to do anything like that. can someone point me to the right direction? Altimatly I will have a separate client on my side, that will communicate to my local XMPP openfire server, which communicates with the external XMPP server.

thanks.