My Mac won't let me put files into my external hard drive

I have a Lenovo USB external hard drive. I want to put files on it, but my Macbook air will not allow it. I am not sure what the problem is. Please help!

https://support.apple.com/kb/HT3509
Apple has a handy search function on their web page, so you can go to the upper right searchbox on most pages and type in what you need.  Just typing in "format hard drive" gave me this result. 

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