Click on your name at the top of the screen and scroll down to the bottom where the "About Me" box is and erase whatever you want.
Resolved: I want to erase About Me
Perhaps you can try some random character instead of a completely blank entry.
Just updated mine so http://support.chess.com/Tickets/Submit "Technical Support & Bug Reports"
How do I erase all the stuff I wrote in my profile? About Me?