Log in to the HTML5 client.
Select the Risks tab, available in the Work workspace.
In the Risks Home Page – Single project selection, click on the Risk Name of the Risk card to open the Risk dialog box.
In the Mitigation section, click on the button to open the Mitigation Plan popup.
Select the Mitigation Items sub-tab.
Click on the Check mark button to turn it green () and mark it as Completed.
The Completed Date is filled automatically.