Did you find the IP address that I was referring to? And were you able to set up a static IP at all (even if you weren't able to go through the whole port forwarding process)?
I know that it can be daunting. The first time I set up port forwarding, I was having head spins over the info & where to put it!
The key is to write down all of the info that you need to use for setting up the static IP & port forwarding. And just go through things slowly & carefully. I printed out every page of the static IP setup instructions & port forwarding instructions.
After having a closer look at your router's port forwarding instructions, it seems like they're not exactly easy to understand. So... don't feel bad if you fell to bits at that point!!
If you want to try again at some stage, we'll help you as much as we can