I have a micro SD with an adapter so my mac can read it, but I cannot delete the videos off of the SD. Everything is in read only and I have googled how to fix this and nothing has worked so far. If anyone can help, thank you very much in advance.
in that case the card seems to be write protected. In that case the only thing you can do with the card is to try it with another pc to see if there its also write protected. If yes then the card is defective and needs to be replaced
you can ask Sandisk for replacement under the following link