I made an error on an assessment value that I already saved. How do I go back and change that value or delete?

Navigate to Functions -> Fitness Assessments -> View Members and query needed member. Choose Graphs and click on the date that needs to be edited or deleted.

Choose graphs needs to be removed;
Replace with "Choose View Details. Click on the date that needs to be updated, edited or deleted. Make the necessary updates and click 'Update Assessments'. If you are deleting the assessments, click 'Delete Assessment'. Updates you make to this area will update the graph.