Acme Exercise application location not found

Lesson 4 Exercise:
academy.appian.com/

instructs me to "Log into your Appian Community Edition environment, and select the Acme Exercise application."

I cannot locate "Acme Exercise" where I could work with an Expression Editor.

"Acme Solution Site" takes me to 
https://swmi.appian.community/suite/sites/acme-exercise-site
but  I am not able to locate an Expression Editor

Where is "the Acme Exercise application"?