Make sure you update your Constant Data Record in WorldShare (OCLC.) Please see instructions for updating Constant Data Records. The example given is for adding the COKAMO courier code. Follow the same steps but use the Kansas Library Express courier code (KS###) for your library.
A group has been setup in the OCLC ILL Policies directory that lists all OCLC participants in the Blue Sky Express Courier service. The code for this group is BSEC.
If you prefer to set up custom holdings groups, you are welcome to use the following Word document to copy and paste lender codes, based on their lending policy group.
Instructions for setting up custom holdings groups are posted here. Custom holdings instructions