How to de-register the group?

I want to use another email address for the beagleboard group. Could anyone share how to de-register the current one?
Thanks a lot!

Best Regards, Jianjun Liu

China Wireless Technical Center
Texas Instruments Semiconductor Technologies (Shanghai) Co., Ltd.
E-mail :
Phone : +86 21 23073338
Fax : +86 21 6350 9583
Address : 32/F China Fortune Tower, 1568 Century Avenue, Pudong New Area, Shanghai,200122, P.R. China

Click the links on the bottom of every email sent to the group (also here ^^^^):