From CLAWSWiki

Disabling accounts does not have its own section. First, you must find the account you want to disable by using the Manage Account option. Then you may change its status to Disabled.

Step-by-Step

1. First, click on Accounts in the menu bar, then on Edit Account.
2. Type in the username you want to disable, or search for the user using the search form.
3. After you have found the account, the user's information will come up.
4. Click on the box next to the word Account Status and choose Disabled.
5. Click MODIFY at the bottom of the screen.

The account is now disabled. To re-enable the account, follow the above instructions but choose Active in the drop-down box.