Comment on SimplyGrey inkscape theme by Scnd101

hello
I'm new to linux!! and I would like to install your icons but I don't know how to extract the zip file.
I get a message saying that I don't have the permission to do this.
I only tried to do this in the graphical way...
Can you explain it to me... having in mind that I don't understand very well the console commands.
Thanks

I love your Icons!!!!!
Paulo from Portugal, Lisbon