Hi Alexander,
I receive the same when I try, reason being it is not fully available in the trial. The blogDevelop, Deploy, Configure, Consume Fiori Apps using Fiori launchpad/ HANA Cloud Platform
mentions FLP and confirms that it is not available yet. If you read the directions detailed by Inbal and reference the help documentation you will notice that you don't have the option in the trial to accomplish the steps. Regardless, I would recommend reading the SAP HANA Cloud Portal Documentationso that if it becomes a feature in the trial or you decide to subscribe you'll be ahead of the game 
I hope this helps.
Kind Regards,
Liz Thorburn
(Technology RIG)