how to block apps??

hello there, we are trying a program called "Kerio Control" in our systems as a firewall but we face a problem and hope to help on solving it.
the network is Wi-Fi, users are not allowed to download, upload mobile apps or stream videos or use the Play store or apple store etc., Just allowed to check emails, surfing the internet.
we blocked so many IPs but that doesn't work, we blocked ports, but it doesn't work either.
any suggestions ?