You have a dynamic IP not a static one but that shouldnt cause a problemas thats your WAN IP address.
The IP address that needs to be in your router is the LAN IP address of the computer that you are using the Bit Torrents client on.
If you go to your pcs network conections folder and click on your LAN connection icon it will show you your pcs LAN IP address at the bottom left side of the folder, under the Details section.
Thats the IP address that you need to have in the router for the ports that you wish to open.
Bit Torrents work in the range starting from 6881, from memory, so if you open a range of say 6881 to 6886 that should work ok