On the App Launcher tab of my developer org, it's not showing the Dreamhouse App I installed even though I followed all the instructions in the Trailhead instructions in the Getting Started with SalesForce Platform module. I have since seen that there are two possible versions of DreamHouse to launch but I'm not sure how to proceed since the Trailhead instructions has lead to installing a version of of Dreamhouse I'm not seeing on my org. Does anyone know how to proceed so I can complete this Trailhead session?

I have created a new developer edition, yesterday. But I don't get any email to set my initial password. 
When try to reset the password, I get the security question "Where were you born?". I don't have the answer cause I never set it.

I also tried to create another org today. Same behaviour.

Roland