iCloud pass

If by iCloud password you mean your Apple ID password, you can do that on the web site by signing in to your Apple ID. See the 'On the web' section in the article below.

 Apple ID Password Change.      

 What to do after you change your Apple ID or password - Apple Support     I suggest doing this before you change your Apple ID or password.

No you can't to do that unless you have set the Apple ID upon a new device.

But, you have the Apple ID you signed in here with. And, and you can change it if you want.

See Change your Apple ID https://support.apple.com/en-us/HT202667. 

And, here is What to do after you change your Apple ID or 

Password https://support.apple.com/en-us/HT204071 (supplementary to what the fist link says)

Yes, jean-claude65.

You can access iCloud via the Web, at iCloud.com, for instance.