Somehow I don't know what number I should be looking for. It says Speed Stream 4200. And on the list I don't see a Speed Stream 4200. It has all the speed streams except 4200.
Read what I said
The only thing unique between all the different tutorials is where you where in your router control panel to find port forwarding setup (and some minor differences in how the information for port forwarding is entered). Just look around in your router control panel yourself and find it.
Unless your router manufacture is seriously handicapped, one of their goals should be to make their products user-friendly. Searching around the control panel for the page for port forwarding is not hard at all and shouldn't take more than a minute.
Additionally, if it's only a slightly different model number, there's a good chance that the control panels are roughly the same. Just choose one of the existing tutorials and see if the control panel is the same. If they're not, just look for the port forwarding page yourself (again, it's easy, don't be intimidated and just look around). Once you find it, if the entry form for port forwarding is also different, and you can't figure it out, just screenshot it and I or someone else will tell you what to put in.
Sorry I'm taking a vacation for the summer and the computer I'm using is crappy.
Again, a router and a computer are two completely different things.
