Where do you find the Wednesday weekly challenges to activate in early access?

Hit on the top of the page:
Challenge Tab / Challenge Central / Challenge Type put check in weekly and they should come up.
You can also scroll just past the early access information where you will see the daily challenges and the weekly. Just hit the box and activate then hit again to play.
Hope this makes sense.
GL!
 

thank you very much!!

You are Very Welcome!!