software reboot
i want to restart my macbook so i can set the entire thing up as if i just opened it from the box. every message, etc, that pops up on my iPhone simultaneously pops up on my mac because i mistakenly used my iPhone ID when setting up my mac yesterday after i purchased it. i want my mac to have its own identity (email, iCloud account,etc). how can i reboot my entire software so i can return to the initial setting-up stages?
MacBook Air, OS X El Capitan (10.11.6)