Find your USB drive in the list. It is usually labeled as "Removable" and will show a black bar if it is unallocated. Right-click the block representing your drive's space.
The USB drive is Write-ProtectedCheck for a physical "lock" switch on the side of the USB stick. If there isn't one, you may need to use the Diskpart "attributes disk clear readonly" command or a registry edit to remove the software lock. how to format usb windows 10
Selecting the right format depends on how you plan to use the drive. Find your USB drive in the list