Step 1: Create a DDNS account(username and password).

Step 2: Log into the router by typing the router IP on the address bar.

Step 3: Click on Tools and select Dynamic DNS from the left pannel.

Step 4: Put a check mark in the box next to Enable Dynamic DNS and select your Dynamic DNS server from the list.

Step 5: Type the dynamic dns host name you created in step 1.

Step 6: Type the username and password for your DNS account.

Step 7: Click on Save settings to apply the settings.