You would delete video clips and anything from it much like you would with your computer or device that you are using to read and write to it. If you are having issues erase things, check the owners manual of what you are trying to use to delete it. If it's a computer, simply open a file browser and find the files you want to delete and delete them. If you are using a phone, download or find a file manager program and the same thing, find what your looking for and delete it. If it's still in the camera or whatever your using, then you are going to need to find out how to access the stuff in the menu to allow the camera to delete it. It's really hard to say, it's all going to depend on what are you using that uses the card and how that device access the card. It's really just deleting the files you want, the card itself doesn't delete them, you have to have something that can access the card delete the files.