I had the same issue. First, you have to create a unique URL for your league under the commisioner / League settings tab. Then follow the directions I recieved from Yahoo support below: Enable league historyforums.yahoo.net/t5/Community-guidelines/Why-do-we-restrict-the-posting-of-phone-numbers/td-p/192804">Learn more.***cont1" class="yiv***Phone Number Removed - Learn more.***strong>In Fantasy Basketball, Football, or Hockey: From Yahoo Fantasy, mouse over Fantasy | select a sport. Click the Commissioner tab. Click the League Settings tab. Click Edit League History. From this screen: Link past seasons with the current league. Associate the history of any league that a manager participated in the past. Eliminate any league history for a particular year. Click Done.
... View more