how setting in the mikrotik routerOS?

How setting in mikrotik RouterOS so that selected IP only can just Yahoo Messenger?
Thank
kahana_2004@yahoo.com.sg

first find out how you can block YM (google for that).

them make appropriate firewall rule that blocks it

then make an address list with addresses that will be allowed to use YM

then make a firewall rule that allows YM for your address list

more details in the FIREWALL MANUAL

Thank for you reply, but is not that which I intend.
which I intend is, how make user can Yahoo Messenger only and how setting in the mikrotik router?

Regard
Kahana

that is exactly what i wrote. i think you didn’t read carefully