Yes, it is possible to run a Project without creating any rewards in it. There is always one option to back the project with any desired amount and that is without selecting any rewards.
To create rewards in a project, follow below steps:
1. Open the profile page of the project.
2. Now, go to the dashboard of this project.
3. Click on “Rewards” from the options displaying on left side of the dashboard page.
4. Create / edit / delete various rewards from here.