Always check the dates of posts.
It can determine their "freshness."
How to sign up for Jedi Training:
NOTE: As of recently, DHS has been actually opening to guests (unannounced) at about 8:30-8:45AM (or so) on days when the published opening time is 9AM.
I'd plan on arriving at DHS -at least- by 8:15 so as to be in a better position to enter the park when the gates open to sign up for Jedi Training and to grab TSM FP's.
On AM EMH days, I'd be there by 7:45 or earlier (if you are a WDW Resort guest.)
Arrive well before park opening time.
When you get inside, take the child with you to the sign-up area.**
You'll get a time for the child to return to the Jedi stage and participate.
**Sign-ups will be either just past Hollywood & Vine Restaurant, or at the Sounds Dangerous entrance (even inside the Sounds Dangerous building,) or at the Jedi Stage.
Look for the sign-up area, in the order of the above, until you find it.