I't says in myooma that when you add a second number it may take up to 10 minutes for it to work. But it's now been over an hour and still no go. If this doesn't work by the morning, I'm taking it back to Frys and stick with my Magic Jack.
Feed your MagicJack dialtone to Ooma's "wall" port and your Ooma device should start working.
As for the 2nd number, if after you get Ooma up and running like above and the 2nd number still doesn't work, then power cycle your Ooma.
If I were you, I'd call Ooma customer service tomorrow and have them change your setup to standalone mode. Get a number assigned by Ooma and forward your MagicJack number to the Ooma number. The standalone mode runs much cleaner.
I am not sure if your MagicJack needs to be running in order to forward calls though.
Once you are satisfied with how Ooma runs, you can port your MagicJack number over. You do this via my.ooma.com "Add-ons" and purchase Number port.