I am trying to install new os x in to my iMac but it says this disk is locked is anyone can help me to unlock the disk

i am trying to install new os x in to my iMac but it says this disk is locked is anyone can help me to unlock the disk

Launch the Terminal app, copy & paste this command into the window that pops up, and hit the return key. At the Password: prompt, carefully enter your admin password, since nothing shows up on the screen, and hit the return key.
sudo chflags 0 /Volumes/
Then, copy & paste these next two, one at time, into the window and hit the return key after each:
sudo chmod a+rx /Volumes/*
killall Finder
Quit the Terminal app and try installing again.

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