No Administrator.. Or IOS.

I'm currently using the internet option from a macbook pro that has no operating system. I attempted to install from external HD, but was instructed by device that this was not authorized and to startup with cmd R and adjust through Startup Security Utility. Attempted, and denied. Needs to be authorized by Administrator, however, it also informed me that there is no administrator. I've partitioned and mounted and first aided this thing far too many times and shouldve asked for help sooner...?