The steps to delete a User Application Driver in iManager are
1. Open a browser and login to iManager (http://servername/nps/servlet/webacc) as the admin user
2. Go to Roles and Tasks -> Identity Manager -> Identity Manager Overview -> Select the Driver Set.
3. When the Driver Set appears, select the 'Delete Driver' Button
4. Then choose the User Application Driver that needs to be
deleted, and press OK