E 2500 port blocking

I am trying to block outbound and inbound traffic on TCP 5222 and 5223 on my E2500 but cannot figure out how. 
The reason is I have kids in my house using KiK (texting app) on iPads, iPods etc.  My goal is to eliminate this applications ability to function for ANY wireless device connected to my WLAN.  Any ideas, thank all.

Apps can't be blocked on the router. What you could do is to block those websites/URL used by the apps or by keywords.
I have here the ways to do it.
Setting up parental controls to block specific websites
http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=3f929507766a432aa28c3aeca9e19833_Setting_up_parent...

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