First Seasoning - start the digital model?

[Tmg]

Have never had a smoker before. But had the best ever
pork roast from a friend with a Smokin-it. And here we are. 

Received the 2D - looks beautiful.
Have the smokin-it app. 
It’s hooked up to the wi-fi.
In the app, from the pull down menu, Cooking Profile set ‘Step 1’, Smoker temp to 250
Timer to 4 hours

... now what? How does it start?

Also, do you need to put the probe in for the seasoning round?