You can use the Credentials page to delete a Credentials resource in a project.
NOTE:If you delete a resource, it automatically removes the associations for the resource, including those assigned to workloads that are in progress and completed. If the same associations apply, consider whether it is more appropriate to edit the resource name and its user name and password.
In the Web Interface toolbar, select Resources.
Select the Credentials tab.
View the list of Credentials resources.
Select the appropriate credential, click Delete, then click Yes to confirm the deletion.
Click Close to exit the dialog.