You Are A Generous Parent , We Are using the iPod touch .but problem is they spend all time on the thing texting their friends when they cloud so More important things like there any one you are work,of course pull the thing out of their Hands,but if You connected to the internet via Airport Base Station Try this bellow.you go to first grab hold their device And Go to Settings >General >About .And Scroll Down and look of the WiFi Address Entry.and this is the Hardware Address or ( Mac Address) that is Unique to that Device .And Then Write it Done.
Now launch Airport Utility And select the Airport Base Station and that connects to you r Broadband connection Modem then Click Edit .click on the Network Tab and the Enable the Enable Network Access Control Button.in the Sheet At Appears to click on the plus button to Add you'r Wireless client .then you to Change by the When using iPod Then Mac Address in this field .Let us now configure The pop up menus for those days and times for Wireless Access is Allowed So may be for an hour after they You are Used for this Process when Cloud Places.
When You have its Configured then Device To you'r liking ,click and save.then click Updated to should you mobile to use network access Wireless network outside of allowed Hours THey Are All Find their Way Of Blocked.
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