In order to purge cache go to your corresponding Pull Zone under Zones and Click on Manage Cache. There are 2 ways to purge:
1. Purge All: This option will purge all files from the site's cache on the edge servers and gets rebuilt from the origin from next request.
2. Purge Files: This option enables the user to Purge Individual files from Edge Cache by specifying those files in the available Purge Tab.