OS X base system is locked, unable to install Sierra on Mac I made a boneheaded mistake while erasing my hard drive (can’t tell you what that mistake was) and now I can’t reinstall macOS! Can someone tell me what I need to do so I can free up the hard drive and correctly reinstall the new copy of macOS?

I’d appreciate any advice and guidance. I’ve posted the pictures to provide details.
Boot to Internet Recovery Mode (shiftaltcmdR)
Open Disk Utility and erase your internal disk
Install macOS (the macOS that came with your Mac, or the version closest to it that is still available will be installed). 
After rebooting and configuring your system download and install macOS Sierra.