I cannot pass information from my Mac to my external hard drive, what can I do?

Hello,
This is my first Mac and I am new to all of it. I have an external hard drive that I use to use with my old PC . On the external hard drive box it says its compatible with both windows and Max os x. I can pass files from my external hard drive to Mac but I cannot pass files from my MacBook Air to my external hard drive. No messages comes up or anything explain why it simply doesnt allow me to do so. What can I do?

Your hard drive is formatted NTFS for windows.  That format is read-only from OSx.  If it's not needed on Windows anymore, you can use Disk Utility and format it for the Mac.   Mac OS extended (Journaled)  - Partition Map scheme of GUID Partition table.
Make sure to save any data from the drive as it will be wipped doing the above.

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