Oh, I see. I thought the OP just wanted to change the default terminal emulator used by Dolphin not the terminal part in Dolphin.
What are you trying to move where, from where and how? At the command line? In Dolphin?If you are in the wheel group, what does the addition of the user-specific line above achieve?Note that what the sudoers lines should be allowing is for you to authenticate and perform actions with elevated privileges. It should not just allow you to do those things without authentication.