I wanted to change the title, but its not possible

To get help quickly, the information you need to provide is:

• Which title did you want to change? (URL is best here.)
• What change did you want to make?
• What did you try? (Exact steps are best here.)
• What happened? (Screenshot of error can be helpful or copy/paste the error message.)
• If you submitted or saved, what is the reference?

Staff may be able to investigate given only the reference but with the other information, experienced contributors may be able to help too and they are likely to see your message sooner.