When you log into your router and go to port forwarding, it should ask for your IP address (probably host in this case), internal and external ports, and the protocol to forward.  So, for internal/external ports, put in 2500, or if you want to forward a range, do that, and choose either UDP or TCP/UDP under protocol.  I am assuming that "host" is meant to take your IP address, so type that there.  To find your IP address, open a command prompt and type the following:
ipconfig
If you have trouble navigating the command prompt window with your screen reader, type the following to output the info to a text file:
ipconfig > c:\filename.txt
In case your screen reader isn't set to read punctuation, that's ipconfig, then a greater than sign, then the path and filename of your choice.  Putting it in root C is easiest, so something like c:\IP.txt.  Open that file with notepad, navigate down to the network adaptor listing for your connection, usually something like "wireless local area connection," and you'll find your IP address there.  It should be listed as IVP4, and since you are behind a router, will probably be a private address beginning with 192.168, or in some cases with 10.0.  Hope that helps.