How can I change the permissions on a USB so I can save files on it?

Recently I’ve got some issues saving files on USB flash drives. It doesn't allow me to save on them so when I check the sharing and permissions tab it says: “You can only read” Does anyones knows how to change this? 

JuanG. wrote:
when I check the sharing and permissions tab it says: “You can only read”
It could be that the drive is formatted as NTFS (default Windows file system). Out of the box, Mac OS X has only read support for NTFS. You can use Disk Utility to check that. If that is the case, you need to reformat the USB drive (this will destroy any data stored on it, of course).
(1) If you plan to use it with Macs only, format it as Mac OS Extended, or Mac OS Extended Journaled. You should also check the partition map type, it should be GUID, which may, or may not, be set automatically when you reformat the drive.
(2) If you plan to use it with Macs and Win and nothing else, format it as ExFAT.
(3) If you plan to use it with Macs, Win, and other devices (eg, media players), format it as MS-DOS (FAT).
For (2) and (3), the partition map type should be MBR; again, this may or may not be set automatically. If it's not, you need to change it in Options.

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