mikrotik router os firewall

hello guys,
i m deepak i m using mikrotik router os 2.9 in my network i want block some ip in my network (means internet not working any website not open in some pc) but outlook working in internet block pc how its doing possible in mikrotik router os please tell me and give me help…

give me solution as soon as possible

thanks
deepak
agarwal.deepak1@gmail.com