Go to the top right hand corner of the Definition Center once you log in, and click on the search box. Enter the name of the project you want to move or copy. You can also move or copy from the 'My Projects' tab on top left. Once you have done either one of those steps, you can find your project thumbnail, which should have a checkbox next to it. Just select that checkbox, and you can move your project:
There are also other choices under the 'More Actions' drop down, including Rename, Delete, Import iDoc, and Export iDoc.