How to change password in CPanel?

I need to change password in CPanel in my hosting.

I can change it in CPanel, but do I need to write new password anywhere in Dolphin files or MySQL ?

If your host uses cpanel and you just want to change only your cpanel password you will be fine and nothing to change in dolphin related files or database.

If you were to change your cpanel login name you would have to make some changes do dolphin paths, database, and files. This is very rare that one would change their cpanel login name on the same host. Generally happens when you change hosts.

Nothing wrong with changing your cpanel password. And if you had someone doing mods for you that you gave cpanel access to, it is a good idea to change that when they are done. Or if you suspect anything out of the ordinary. Be sure to choose a good hard to guess password.