To edit the league name and/or description, go to Setup > League > Rules and change the league name and description as necessary.
If the software was licensed to a named league, then the name and description will always remain showing as the licensed league name. You can add to the end of this, with additional text, providing there is room.
For example. If the software was licensed to the "Tue Mixers", you can change the description to:
"Tue Mixers 2020"
"Tue Mixers by Max's Deli"
If your league contains a sponsor name or lacks one or needs complete changing, you will need to complete and return a license transfer form located at https://www.cdesoftware.com/transfer.pdf
along with $10.00 to change the name of the league. The president of the league will need to sign on behalf of the "outgoing" league name.