Video: OS X 10.9.3 Find My Mac Hides “Users” Folder
In OS X 10.9.3, turning on Find My Mac will result in “Users” folder to be hidden.
To make the “Users” folder visible again until next reboot,
login as an administrator, launch Terminal.App and type the command:
sudo chflags nohidden /Users
Type in your password when prompted. If you do not have a login password for your admin account, leave it blank.
By the way, why didn’t you assign a password to your admin account? Set a password already.