Open the Settings app
Tap Safari
Tap Clear History and Website Data
Confirm by tapping Clear History and Data
To delete specific cookies only:
Open the Settings app
Tap Safari
Tap Advanced
Tap Website Data
Search for a site or scroll
Swipe left on the site
Tap Delete
To remove cookies for a specific browser app (if applicable):
Open the app’s Settings
Find Privacy or Clear Browsing Data
Choose Cookies and Site Data
Tap Clear or Delete