I assume you mean how to do you open a port for uTorrent in the SmartAX-MT882 modem.
If so, portforward.com has guides for that modem and uTorrent,
Unfortunately, there are 3 different models of that modem listed there, so I can not link directly to the guide.
Do a search for "Smart" on this page. When you determine which model is yours click on it and you will be taken to a guide for uTorrent and the modem (with an advertisement in between-just press skip)
http://www.portforward.com/english/applications/port_forwarding/Utor/Utorindex.htm
This guide has more up to date screen shots of uTorrent to go with the guide and other information to help uTorrent download speed:
Optimizing uTorrent For Speed
http://www.techsupportalert.com/content/optimizing-torrent-speed.htm
You set the port that uTorrent uses at Options>Preferences>Connection
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You want to open the port that uTorrent is using. You can set that port in uTorrent at Options>Preferences>Connection. Opening the port will greatly help speeds. To open the port, you need to set an exception in any firewall, software or hardware (router), on your system. This guide has info to help with that: http://www.techsupportalert.com/content/optimizing-torrent-speed.htm
The port speed setting for a modem, controls the speed that the computer communicates with its modem.
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A USB modem plugs into your USB port.A "normal" modem plugs into your RS232 port or your parallel port.
Port speed is how fast the computer talks to the modem. Modem speed is how fast the modem talks across the phone line to the other modem.
The best port is the one that isn't being used. Try using a port above 45000.
Check your router its utorrent btw
Yes, this will connect a computer to a second port on your modem/router
If your not using it then don't worry about it. But motherboards don't come with a modem port. A modem port is on an add on card like a PCI Modem. Take out the old one and insert another and load the drivers from the included CD that is the cheapest way.
You need to connect a modem using the modem port and the telephone cable.