Unable to write in an external drive

Hi, everybody:
I am unable to write or work with the material I have in an external drive. I can see it, but nothing more. I see I have only permission for 'Read only' ('Solo puede leer', in Spanish), but I can't change it because there is no 'lock' to open there, or an evident way to do it. And I don't want to touch things in the System Preferences without knowing.
What can I do?
Thank you in advance for your help,
Remedios.

Thank you, Barney-15E. I can't reformat the drive, because I have there a lot of valuable stuff. Stuff I need to work with.
Hey... I'm a little disappointed with this. How is it that this super computer (the iMac is really wonderful, I agree) can't work with a simple hard drive I can use everywhere else..?
Well, anyway, sorry for disturbing you with my problems. Which one, Paragon, Tuxera, you recommend?
Thanks again,
Remedios.

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Unable to write in an external drive

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