Step 1: Open your web browser and type in the IP address of the router (192.168.0.1 by default). Enter the username (admin by default) and password (blank by default), and then click OK.

Step 2: Click on the TOOLS tab and select ADMIN.

D-Link DIR-330 as a sample:

Step 3: Check the box Enable Remote Management to enable this feature. When enabling remote management, you can specify a specific public IP address on the internet that you want to have access to your router or you can enter an asterisk (*) to allow access from anywhere on the internet.

Step 4: Select a port from the Port dropdown menu to specify the destination port for the remote management.

Step 5: Click on Save Settings.