Permission needed to change icons of native Apple apps Okay so here's my problem. I want to change the icons of the Dashboard, Launcher, Quicktime, Notes, Mail etc. But when I paste my icon to the top left mini icon in the preview window (on the Get Info page) it won't let me. 
Then I tried to change the permission settings to be able to edit the icon or change anything in the application folder but it tells me that i do not have the permission even tho I'm the sole user of the Mac. 

I'm on El Capitan so I don't know if it's because of the new upgrade.
Turn off your Mac.
Boot it in Recovery Mode by holding down ⌘-R until the Apple logo with a progress bar pops up.
Click "Utilities" in the menu bar, and select Terminal.
Type the command "csrutil status" and press Enter. 
If enabled, type "csrutil disable".
Press Enter.
Click the  in the menu bar and select Restart. 
Now, the copy and paste method should work.


For more detailed instructions, check out http://hashbangstar.net/blog/changing-icons-in-el-capitan

You can also download a program called Liteicon from 
http://www.macupdate.com/app/mac/24764/liteicon

You still have to do steps 1-8 but it makes changing icons super easy! You can also easily change the Finder icon and Trash Can by using the drag and drop method.