1. This is Widget, not App, if you install it, you should go to Launcher(press Home), Menu->Add->Widget. Android Market OPEN button won''t work.
2. Some devices does not support TETHERING. This mean that there''s no way to have my widget working. Please read tutorial before installing.
3. Some devices require password. Please follow this link:
http://wp.me/p4cabV-k it might help.
4. Again, this is Widget which helps use Tethering, not featuring your phone with it.