Under Admin. > My Blogs > Change Blog Address...
It is not working.
Tried 4 browsers, approx. 10 attempts total, all give same INCORRECT error message, ie, "only lower case & numbers allowed," which does NOT even apply because it WAS typed in LOWER CASE each & every time.
I see other threads saying people cannot create new blogs either, so the two problems are probably related somehow "behind the scenes."
The new admin & settings are all funky. Please give us back the prior prettier version w/o that horrible flat look, black sidebar, squares vs checkmarks, etc. It worked fine before all the new changes & was much more pleasing to look at.