In your account go to your projects page, either by clicking on ‘Projects’ in the nav bar on the left hand side of your screen, or by clicking on ‘View all projects’ in the ‘My projects’ section.
Click on ‘manage’ on your project to see the funds your project is submitted to. For each fund you will see a ‘reject’ button. If you choose to reject a fund, your project will be withdrawn and the fund will not show up again in your account. You can still apply with a different project.