User-defined scores can be modified or deleted. To do so, select the question you want to alter a score for, then navigate to Settings > Scores. All user-defined scores for that question will be listed. Click on the score you want to modify or delete.
To modify the score, edit the formula, validate it, and click the Update button.
To delete the score, click the Delete button at the bottom of the page. Please remember that other members of your organization might have incorporated the score in their dashboards or reports. Consult them before deleting a score.