DB2 8.1, Z/os 1.4

We are pllaning to use MQ in the near future. I have some questions, and I would appriciate if someone could help me.

I edited the DSNAMT and DSAMTHT files and changed defaultConnection. After I transfered (bin) to the host it works fine for all default settings. All messages are now send to the one location. As I understand if I add new service, the message would be send to the other que. I need a least 2 locations, so one would be for testing and the other for production. I copied ServicePoint section and changed DB2.DEFAULT.SERVICE to my service, and I also changed QueueManagerName. When I tried MQSEND in SPUFI it works, but MQREAD doesn't. I obviously have to change some more paramters in this file.
How can I make MQREAD work?

Mick

Ups, I made typing mistake in the file. I works now. But I would still like to know where can I get information how to edit DSNAMT. Installation Guide isn't very hellpfull.

TIA

Mick