This tutorial takes you to step by step on how to block unwanted sites for PLDT Kasda modem.

Step 1

Connect to your network and enter the following web address: http://192.168.1.1

Step 2

The ADSL Router Login will appear.  Use the default username and password.
username: admin
password: 1234

Step 3

Click Firewall on the upper box next to Setup then select URL Filter.

Step 4

On the right side, there's an option for URL Blocking Capability.  Choose enable then click Apply Changes.

Step 5 

On the keyword box, enter the keyword of the site you wish to block and click Add Keyword.  Choose Delete Selected Keyword to unblock.  Just select a keyword on the URL Blocking Table and click Delete Selected Keyword.

Step 6

Last, don't forget to save to make it effective.  You can now try the sites if you've successfully done it.