Yes, usually you type in your main ip address into your internet
browser and you can access your router config. Then look for a nat
forwarding thingie, where you can specify which ports for udp, tdp
kind of thing. Match the numbers with the one on your bt
client.
But opening ports not necessarily will speed up your d/l. You can
have 5000 seeders and 6000 leechers and your speed will still be
like fcuk one. 
Take last night for
example, I was d/ling Confession of Pain, there were only 20
seeders and I could tap only 8 on my open ports. But I was so lucky
one of the seeds was throwing me 100kb/s constant, and the 700mb
movie was done in like 3 hours, otherwise 2 full weeks.
I would recommend you increase your upload, occasionally you get a
slight boost. But of course it might be an obstacle to your
downstream. And when you surf the net while your bittorrent is
running, I recommend you don't load pages which are pic intensive,
all the bandwidth will go directly to loading your webpages as
priority.
Overall, takes a bit of luck lar.
