Edit: I have checked your device, and it would seem that the project was not created where it should have been. The project should not be Created in the Nebula Dashboard, but rather through Stellar.
I will link some of the help materials which might be of help to you:
If you have further issues, email us at support@yellaumbrella.tv and we can set up a quick online session on how to use Stellar for AD.
Kindest regards,
Cristian
Initial Response
Welcome to our community!
If the project was created correctly, you should be able re-open if you go to Files - Project - Recent. It should appear in the list that will open after clicking recent. The last project you have had Open in Stellar will appear as the first in the Recent Project List.