Page 34 of the Webelos handbook has a good diagram of the where the insignia should be placed. You can also find this information in the Uniform Inspection Sheet PDF attached here:
Den Patrol Name
As Webelos we are able to choose our own Den Patrol Name. Please see the attached PDF. Our first order of business will be selecting our emblem for our uniform that goes with our Den Patrol Name. For example, if you like the Alligator emblem, then you might suggest our Den Patrol be called the "Amazing Alligators."