Turn on Restrictions from Settings > General > Restrictions and set a passcode. Scroll down, go to...

From the Apple menu  in the corner of your screen, choose System Preferences. Click Software...

Go to Safari > Empty Cache , or hit Opt + Cmd + E. To refresh, click the refresh button on the...

Press and hold down the Command (⌘) and Control (Ctrl) keys along with the power button (or the...

Boot from the Recovery HD volume by restarting your Mac while pressing the Command and R keys. The...