Summarize the following:
The dolphin icon is at the bottom-center of the screen. This displays options bar at the bottom of the screen. It's below an icon that resembles a brush or duster.  This opens the menu for clearing your data. You can also find this option in the General Settings menu under "Data". There are six types of data you can select.  The six data types are as follows:   Browsing history:  This is a list of all the websites you have visited, saved by Dolphin.  Cache and site data  This is the website information saved by Dolphin to load your websites faster.  Cookies:  This is information generated by a websites you visit.  Form data:  This is the personal information you provide to a website that Dolphin has saved.  Passwords:  This is the passwords you used to log in to a website that Dolphin has saved.  Location access:  This is all the location information saved by Dolphin generated by your phone's GPS. It's the red button below all the data types.  This clears all the data types that you checked.

Summary:
Tap the dolphin icon. Tap Clear data. Tap the checkbox next to the data type you want to delete. Tap Clear selected data.