I can't remember what happens when I update my iOS: will I be asked for my iCloud password? I would like to delete my iCloud account ultimately and I guess if i didn't have an account I wouldn't be asked for the password after updating my iOS but just wondered if I will be asked while my account is active.
You will be asked for your Apple ID and Password. Often, this is the same thing as your iCloud account but it doesn't have to be. If you run into problems, you can contact Apple for assistance.
You can follow these instructions for how to update your iOS device.