Disable User Accounts
If a user leaves your organization, has had their password compromised, or poses some other security risk, you can disable their account. When you disable a user account, the user can no longer log into the program. If needed, you can enable their account again so they can log into the application.
While you may think that deleting the account is the preferred option for employees who no longer need access, we recommend you mark them inactive instead so you can preserve a history of their actions in the program.

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From Administration, under Administration, click Application Users.
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Under Application Users, click the green down arrows
to expand the user account's row.
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On the action bar, click Mark inactive. A confirmation screen appears.
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Enter details about why you're making the account inactive, and click Yes.
The user account is now disabled.