How to block my intranet from internet?

Now i have problems in my firewall.
I use a firewall server with mikrotik 2.9.6 that use for firewall all my Webserver in my intranet environment.Now how to set firewall to filtering the IP?,only in my IP can access it.Thanks before..I’m new in mikrotik RouterOS user.Thanks

on Firewall filter use forward rule to accept your IP, like source and destination to your IP and the drop any.