You will need to provide additional detain about what you are trying to do, but from what little I can guess, it seems alomst as if you are trying to access an IP camera remotely when you are not at home.
In such a case, you could check if your specific router offers a VPN server function, if it doesm then the following may work.
You will need to sign up for a ddns service like no-ip https://www.noip.com/
After adding the ddns settings, you can then enable the VPN server on the router, and follow the setup instructions provided on the VPN page.
Beyond that, if the camera is one of those cloud reliant ones, or the hybrid kind such as many of the Amcrest cameras, then you will need to follow the setup instructions provided by the camera.
