If you want to be able to remote your wireless router TP-Link TL-WR1043ND the 300M wireless N Gigabit router through WAN port, so you can manage the router from other/difference place.
• Login to your TP-Link TL-WR1043ND router
• Go to Security menu
• Choose Remote Management
• Input the port for Web Management port, in example I choose 8080
• Input the IP Address in to Remote Management IP Address, choose 255.255.255.255 to make enable all IP address.
See figure, click on it for enlarging
|Setting for remote management TP-Link TL-WR1043ND|