Hi ArlieMillerr
I am Dave, I will help you with this.
Open File Explorer, then on the left, click 'This PC' on the right, you should see that SD Card, double click it, and you should then be able to delete files form that drive.
If you have any difficulty, check if there is a tiny lock switch on that SD card, and unlock the drive.
If you want to delete all files on that SD card, in File Explorer, right click the card and select Format, accept the details and a 'Quick Format' will be enough to wipe the card.