I found your group through UW web site, and I was very interested in joining your activity.
I am a member of a team in Japan, and I wanted to continue playing soccer while I study English in this area.
Could you please let me know how I can join your group? You can contact me by e-mail at sample@something.com, or by phone at 000-000-0000.

Thank you (in advance), and I look forward to hearing from you.