1. Archive a project
In Kanbanize there is no way to delete a project - you can only achieve it in the system.
To archive a project along with its belonging boards -> click on the Project Settings icon (the dotted menu) of the corresponding project and select Archive Project.
All archived projects in your account are stored in the Archived Projects and Boards tab of the Administration Panel.
2. How to unarchive a project?
To restore an archived project, you need to unarchive at least one of the boards from this project.
Go to the Archived Projects and Boards tab of your Administration Panel -> find the Project and click on "Unarchive" button to the right side of the corresponding board. The system will display the unarchived Project/board on the main dashboard of your account.
Please, check the following article to learn how to archive a board.