@Etmipamidzi 

If you are viewing the camera stream through the phone app there's no need to forward ports since the app uses the vendor cloud to show the stream.

If you use a web browser to view the stream then you have to open ports on your router.

To determine which port the camera is using you can browse the camera WebGUI from inside your network (usually it's port 81) and entering network settings where you can change that port to be static, so you can forward on the router's WebGui page. It's desirable to enable router's UPnP feature as well to be sure that the camera will open the desired port on the router automatically.

Here's a detailed manual for setting your camera properly:

http://apps.tenvis.com/Download/JPT3815W/2013/Advanced%20User%20Manual.pdf

@Etmipamidzi 

Usually these cameras are using ActiveX controls to vew the stream in a browser. That means you have to install that ActiveX control in your browser - IE (Internet Explorer) only compatible to be able to see the stream. Some of these can view the stream in a different browser (Mozilla, Chrome, etc.) but it's limited as a video resolution and web menu controls.

To be able to set things up, just follow the guide I posted in my first post.