How to delete the emails from webmail via single shot

Step 1 : Login into the webmail account.
Step 2: Click ‘Settings’ and select email usage option.
Step 3: It will show the email usage of all the folders under the email account.
Step 4: Click ‘Manage’ followed by the folder or inbox.
Step 5: Select the delete option from the drop-down list and click ‘Delete Permanently’ button to apply the changes.