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Open Safari. Tap the Bookmarks icon (a book like icon at top left next to Forward and backward icon). In Bookmarks, tap Favorites or folder. Then swipe left on the bookmark you would like to delete and a Delete button will appear. Tap it to delete it.
If you would like to clear recent history and website data, then go to Settings tap Safari and tap Clear History and Website data.
Please let me know if that didn't work, so we can continue troubleshooting