Does anyone know how to delete a video clip on a Samsung digital camera?

Please help me. I have to make a video project and I have no idea how to delete a video clip on a samsung digital camera. It says that delete is not an option. And it wont let me delete a video clip. and it wont let me record over it.Does anyone know how to delete a video clip on a Samsung digital camera?you have either inadvertently protected the file , and this will be removed by selecting and unprotecting, or it is read-only on the file itself , in which case you will need to right click on your computer , and properties , and unmark the read-only selection then deleting using your computer.