Last week I have registered in serverfault as Jaiganesh and its worked fine, also I have posted 1 one question. Two days back I have logged by my gmail account & the user id has changed to user1910258. I am unable to edit/update my question. Please advise me.
This is easily fixable. You had an older unregistered account with the name to which the question was attributed. I merged the older user with your registered user, so you should now have ownership, and ability to edit the question.