where do I find "Terminal"?
Where: /Volumes/NO NAME/.Trashes/501
It would be useful to tell us more about "NO NAME". Is it an ext'l drive? A camera? A thumb drive or SD card? An MP3 player? How is it formatted? Was it used with Win or some other non-Mac device?
If it's an ext'l drive, it might be wise to verify it first with Disk Utility, just in case this strange name actually indicates directory corruption. If it's a camera or MP3 player, it might be better to attempt to remove it with the device's own file management facility.
As Mark Jalbert says, in the end—and depending on the file system—, it might come down to deleting it by its inode number, which is tricky; it might be easier to back up whatever files need backing up, and then reformatting it. It depends on what "NO NAME" is.