How do I unlock file permissions on an external flash drive connected to a mac book air?

Hi there, I have just synced my I tunes library to I Tunes on my mac book air using a WD external flash drive (which I have always used as my storage drive for my entire library and was previously running on a Sony Vaio PC) and although I can now see and play all my files I can't download new content as I get an error message stating "there was a problem downloading.... you don't have priveleges to make changes" which from my research is because the flash drive I tunes folder permissions within it are locked to read only.
Which is where the problem lies as I can't see anyway to change this when clicking on the drives in my devices and going to the get info option, as although it shows the permission status - you can't edit that?
Note I know this is the issue as if I change the I tunes media folder location back to the defualt folder as the hard drive on the mac book I can then download new files no problem, however I dont want to store my content on the hard drive of my mac book air as my library is over 300gb and want to keep it all on the external (as I always did when running I tunes on my PC).
Any help will be apprecaited guys!
Thanks

If the drive is formatted as MS-DOS or exFAT, use the Disk Utility in the /Applications/Utilities/ folder to repair it.
If it's formatted as NTFS, either reformat it or install third-party software which enables the Mac to write to NTFS drives.
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