how to configure mikrotik firewall rules

hello
how to configure firewall on access point and how it will configure . in detail

can i purchage the firewall rules or free download

You are putting very general questions. Try to be more specific.
Wiki is a good place to start with.
http://wiki.mikrotik.com/wiki/Firewall_filter#Basic_examples

Hi all, how can i prevent a pptp secret user to reach a specific IP address on RB 433AH firewall?. Any ideas for that?. I need your help please.

thanks in advance.

Presume your pptp interfcae IP is 10.1.1.2 and IP of the device is 192.168.10.1

/ip firewall filter
add chain=forward src-address=10.1.1.2 dst-address=192.168.10.1 action=drop

Thanks for reply, but i meant that i need to prevent a specific pptp secret user like “John” to reach an IP address such as 192.168.10.1. Is there a way to do that?, or no way but to do by preventing the MAC of that remote user?.

Thanks again.

when you configure the pptp secret, do you assign a local IP and a remote IP?

yes, i assigned them (local of router and remote of the remote user).

So you can use the remote IP in the firewall rule, right?