2018.3.3 orchestrator enterprise trial - robot provisioning question

Installer(.exe or .msi):exe

License type(Free, Trial/License code):trial

Studio/Robot version: 2018.3.3

I just installed the Orchestrator/Robot Enterprise Trial on 2 separate servers. I was able to connect and provision the machine key to the robot. However since I’m on the enterprise trial, I’m not sure how to upload a license to provision a robot to the machine. Under the Robot tab, the + button is grayed out.

How can I provision a robot on the enterprise trial without the license key? or how can I find a license key to upload while on the enterprise trial?

Thank you!