When you have a Collection full of clips there are a few different ways to rename the clip. Go ahead and find the video clip you want to change the name of and select it. Right click on it and go down to Properties at the bottom of the pull down menu. In this Properties menu you will find a number of different details about the video clip, including the start and stop times, file type, bit rate, and exact hard drive location. At the top is the proper title of the video clip and you can then type in this box. Highlight the text that is there, delete it, and enter a new body of text. Then hit Apply and OK at the bottom of the window. Another way to rename a clip is to click the text under the clip icon a couple of times until it becomes highlighted. Then you can delete what is there and you can then type in a new title.