You entered the repo address incorrectly, so it cannot load into Cydia and you cannot remove it via Cydia.
You will have to SSH into your phone and manually remove the bad repo.
If you added a source that causes Cydia to crash, this will help you remove the buggy source you added.
You will need an ftp/sftp client. [WinSCP for Windows/Cyberduck for Mac]
1. SSH into your iPhone/iPod, hopefully you know how to do that.
2. Go to the root of your iPhone/iPod [/].
3. Navigate to /etc/apt/sources.list.d/cydia.list
4. Download the Cydia.list to your computer and open it using any text editor.
5. Delete the source you added. For example, "deb
http://www.iphone.org.hk/apt/ ./" if this is the source you want to delete, simply delete that one line. NOT THE WHOLE DOCUMENT. Make sure you save the document as is. We are NOT adding any extensions.
6. Drag the saved document into the sources.list.d folder and replace the file.
7. Re-spring.