I am assuming this is in the browser?
Try this...
1. Go into the browser, tap the "Menu" and then tap "Settings".
2. Now tap "Privacy" and then tap "Delete personal data".
3. On this next screen tap to 'check' each box that you want have cleaned out.
4. Now tap "Delete".
If you are using "Chrome" try this...
1. Go into the browser, tap the "Menu" and then tap "History".
2. On this next screen tap to 'check' each box that you want have cleaned out.
3. Now tap "Clear Browsing Data".