Simply return to the project (for example, by going to "Projects" on your Profile page and clicking on it there), and then click the Delete button in green near the top-right. This should permanently delete your project.

I can't find the green "delete" button.

Where is the green delete button i can't find anything!

The interface has changed. Below your program there is a row of buttons that say things like your vote count. One of those is "Delete".

It's under "about"

Click on your project and scroll down. There you will find a button with a blue outline that says Delete. Click that.

1) Open the project you want to delete

2) Scroll down a bit until you see the button "Delete"

3) Click "Delete" and press confirm

Thanks! This helps!