When I have my JID and I have printed off the documents, how do I collect other JIDs?

When you make contact with other JOTA-JOTI participants you ask their other group for their JID and you give them your JID. Both groups then record the JID of the other on the JamPuz documents. You can take part in JamPuz using which ever method(s) you are using to communicate during JOTA-JOTI; there is no special way of swapping JIDs. Remember, JamPuz is about conversations, not just contacts.