Trackers are links to sites to help you connect to other people with the file you're looking for. The more trackers you have listed the better your odds of having a fast and complete download.
1) make a wordpad doc. to save your list on
*I posted my list copy that to get started
2) <right-clip> and <copy> your list
3) when starting downloaded torrent click the second tab <advanced>
*you also can do this to an existing task:
click task, <properties>,then 2nd tab <advanced>
4) press the <right arrow> key and then press <enter>
5) in the box <right-click> and <paste>
This should of add the torrent list to the task pre-existing list without erasing it, press <Ok>