Thanks for your interest and your patience. The N1MM Dev Team members have been scrambling to test, confirm, and document the configuration settings necessary to operate this new feature in this weekend's ARRL RTTY RoundUp contest.
The initial (draft) documentation is available on the website here:
Documents >Digging Deeper >Windows >WSJT-X Decode Window
The web page contains a candid warning, but we'll repeat the assertion that this is a version 1.0.0 program and untested in any live contest. Despite our enthusiasm for the new interface, we - and you - should expect to encounter issues during the contest. Be prepared with a Plan B.
Constructive criticism and suggestions are welcome. Flames and tirades not-so-much.
-larry (K8UT)