As previously stated, these forums are now CLOSED. There are two main places to discuss ADDM and TPL:
You can discuss ADDM in general in the Discovery (ADDM) Community.
You can discuss pattern creation and suggest new patterns in the Pattern Exchange.
There are a few other places as well (for Beta and Prerelease programs) but the processes for gaining access to those are already explained in the Discovery (ADDM) community linked above.