3 of 4 edited tags; edited tags

How does one edit the title of a question?

I tried changing the title of this question: "How does iPhone icons are of same grid across all model" but was unable to. Is this a matter of accrued points or is there a conscious decision to maintain continuity?

EDIT: Interesting usability issue. I didn't read the error message properly. I simply glanced at it and interpreted it as needing to put in 10 characters into the body of the text - NOT that I had to give a reason for the edit.