Your credentials are very important for your account security and you should never share it with anyone specifically your password unless and until it is needed urgently. You may need to change them time to time to make your account more secure or may be resetting them because of any certain reason.
This blog is very informative and provides you the best possible ways to reset or change your keys. Yahoo Support Number is a service provided by Yahoo, web service provider for its users. The Company is headquartered in Sunnyvale, California and founded by Jerry Yang & David Filo in January 1994.It is used by more than half a billion of consumers and in more than 30 languages.
The above information is sufficient and proficient to resolve your issue still if you face any problem you Contact Yahoo Customer Support Number. For any further guidance and assistance, this team will give best possible way as they have well-trained technicians and expert engineers in dealing with such type of issues daily.