Setting a new Oshimen:
Log in to Account Settings.
Select "Oshimen" from the profile settings.
Choose your Oshimen and press "Save".
Changing your Oshimen:
Go to Account Settings and select "Edit Oshimen".
Choose a new Oshimen.
Confirm the change.
*If you change to a new Oshimen, the streak for that member will start from zero. However, if you switch back to a previously selected Oshimen, the previous streak will be retained.