Android
1. Open "Browser" or "Internet". This is the name of the browser that comes pre-installed in many versions of Android
2. Tap the "Menu" button. This is located in the upper-right corner of the screen
3. Select "Settings"
4. Tap "Privacy" in the "Advanced" section
5. Tap "Delete personal data" or "Clear History". The wording may vary depending on the version you are using