Can't add / edit Name Badge Template Options
Through the UI, you can add / edit Mailing Label format options, but not options for Event Labels. This means unless you are using one of the four pre-configured options, you need to go to the SQL to change between Mailing Label and Name badge to test and use.
/civicrm/admin/labelFormats?reset=1
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information