If you can't find them, you can look in the forums, or in the member directory...
If you can't find them in the member directory, they may need to have a public profile...
At any rate, you add them to your buddy list (they don't need to confirm it), and from there you can transfer 1 to as many credits as you have...
I go 3 to 1 for one point, and 5 TT points for 2 swapadvd credits...
I don't have any more available to trade right now, probably in a week or so I will...
I always keep at least 10 swapadvd points in case something in my wishlist comes up, but since they're mostly rare dvds, it's rare that I get much from there...
I come by swapadvd credits rather easily, but rarely spend them... I have a Smallville season 3 that I just got and need to watch, and have a Lost season 2 coming in from another site... That's 13 credits should I choose to use swapadvd for that... The problem with spending them is that I'm only 1 person... I can't fill my wishlist with both seasons and the rare ones I want, or I'll never get anything from there...