Ahh ok. You have xfinity by comcast and DVR so I assumed you were trying to view their DVR.
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In your DVR can you change the port? I would not use 80 or 8080 since those are default ports. Use something between 1024-65535. 8000 for example.
In the Meye app, enter a name, Address is the WAN/Internet IP address in the D-Link router, not the local IP. Port = the port you entered in your DVR. Enter the DVR's username and password (if required).
In the router, go to Features > Port Forwarding. Click Add Rule. Enter a name, Local IP Address = the IP address of the DVR. TCP and UDP ports = the port you entered in your DVR and in the Meye app. Click Apply.
Test and hopefully that will work.