I can read but I can't write to an external drive - changing permissions

I can read but I can't write to an external drive. 
How do I change permissions? None of the helps here on the discussions have helped.
Why would a computer company let me read files but not write? Hahaha. This is insane.
I have to write computer files for work. It's a project due this morning.
Man, I'm going to have to go back to PC.
Just need the compter to write files.

If it's formatted as NTFS, reformat it as MS-DOS, exFAT, or Mac OS Extended (Journaled) as desired.
If it's formatted as FAT32 or exFAT, use the Disk Utility's Repair Disk command on it.
If it's formatted as Mac OS Extended, click Authenticate and provide your administrator password, or change the permissions on that specific folder in its Get Info window.
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