How To format your card in your PC
1. Click your windows key and the letter E at the same time
2. This window will open up. Look for the name of your SD card
3.Right-click on the name of your SD card and click the word format
4. Select either FAT or FAT32 and hit Start. Then click ok on the box that pops up and it will tell you when it is done.
If you have a PC and it looks different than the screenshots above try, How to Format SD Card on a Windows 10 Computer with Photos