A video is coming for this, but in the meantime here are some guidelines:
Navigating to the OGM upload control
1) Login to clubhouse
2) Go to the Service Control for your dmConnect12 number
3) Click on the "General" tab
Option A : If you want to upload a wav
4A) Under the "SB12 OGM Upload [Beta]" heading, select extension "Px301" (that is likely the only option anyway)
5A) Click "Choose File" and select a .WAV file from your computer, then click "Upload File as OGM"
6A) You should see a message in the top banner "CustOGM uploaded OK" (and possibly "(Previous File Overwritten)") and the advice to wait a couple of minutes before it is working (This is because it is re-activating your plan).
Option B : If you'd like to record from within a browser
(Unfortunately this doesn't work in all browsers yet)
It works in Windows: Chrome, Firefox, it probably works in many other browsers.
4B) Click "Record OGM in browser..."
5B) Press [Record] button and say your OGM. Press [Stop] when you've got to the end.
6B) Press the "Play" icon to check it's OK (go back to step 5B if it isn't).
7B) Select extension "Px301" and press [Upload] button
8B) You should see a message just below the recording control saying "OGM Uploaded".
You will have to wait a minute or so while the plan is re-activated.