If you are a program administrator, you have the ability to go in and delete users who are no longer with the company.  Just follow the steps below to find the Delete User button.

Start by selecting the three line menu button to bring up the full menu.

Once you have brought up the side menu, click on Administration. It should be the third option below Spot Check.

Once you have brought up the sub menu, select the Users option.

Once you are at the list of users, you can click the user that you are looking to delete

On the Users page, click the "Delete User" button.