Disease terms cannot be changed on published gene-disease records so it must be unpublished first. Select the "Unpublish Summary" link in the "Saved Provisional and Approved Classification(s)" panel.
A new panel will appear above the "Saved Provisional and Approved Classification(s)" panel
You can now return to Curation Central for the gene-disease record, and the "Disease" edit button in the header will be active and allow you to select a new disease term.
After you've selected a new disease term and are ready to republish the classification, select "Administrative Update: Disease Name Update."
An label will now appear in the "Saved Provisional and Approved Classification(s)" panel.