Hello,
I have few questions about RB 493G + Ubiquiti Networks UniFi AP MIMO 2.4GHz.
I have 200 WiFi clients in my network and 10 Mb DSL Link to the internet.
Any Idea how to correctly prioritize network traffic to the internet - that every user will be happy 
And the other question how to secure this network?
Gabriel
[quote=“grubykisiel”] that every user will be happy /quote]
Haha, that will probably never happen. 
Have a look at these to start learning about QoS and how to set it up.
http://wiki.mikrotik.com/wiki/NetworkPro_on_Quality_of_Service
http://wiki.mikrotik.com/wiki/Category:QoS
As for security what do you mean? Are you wanting to secure the wireless or the router? You should really do both.
http://wiki.mikrotik.com/wiki/Firewall