On the main page where you create posts, in the upper right hand corner there is your profile name and pic. Click on the drop-down arrow and select Blogger Profile. It will open a new tab or window. In the upper right hand corner click the button that says Edit Profile. You will then be able to change your display name and all your other profile info :)
Thank goodness SOMEONE knows! I wanted to help but am completely useless! Go Batgirl!
Yay Team! haha:) I couldnt think of anything too original!