EASY! Heres the way I would suggest.
1. download wavepad on your pc-
www.wavepad.com (30 day trial is free)
2. find the ringers you want and open in wave pad, then save as an MP3 file on your desktop. (you can also use the record button in wavepad to record sounds from youtube, or anywhere on the internet then save as mp3)
3. sync your TP2 to your computer using active sync (the disc that came with you phone) and then move the mp3 ringers from your desktop to the sounds folder in your phone. go to Start menu, my computer/My device/application data/sounds) put the ringers in sounds.
HIT the THANK YOU button Maaaan!