Can't change Master Password or get into iCloud

Thank you very much for your timely help and pithy explanation.

I've managed to climb the learning curve on migrating from old 1Password methods to new ones. I'm a fairly smart guy with plenty of tech background, but this took many hours to understand how to navigate 1Password's MacOS and IOS interfaces -- and, most of all, the concepts that underlie them. Examples:
- "Master Password" is not a master password for all apps/devices, it is a Master Password only for a specific instance of 1Password.
- "Personal" vault is created without salient explanation of what it is, and "Primary" vault isn't the primary vault. I couldn't find any explanation of this in any obvious location.
- I had to find this out by trial and error, resulting in having to guess which password works again and again: "The way this works is that the first time you unlock 1Password for iOS after changing your Master Password elsewhere you'll need to use the old Master Password. After the first unlock with the old Master Password 1Password will sync the changes, and from then on you'll use the new Master Password"
- When does syncing take place? I know it's complicated, but an overview is needed.
There are many more examples, like the family vs. individual vaults, naming, etc.

The upshot is that I've spent the better part of a day trying to understand and implement a 1Password.com/Mac/iPhone/iPad sync system, using my existing 1password vault and syncs as a starting point. I assume it is easier to set 1Password up from scratch. But loyal users must have to struggle as I have.

Great product. Very, very difficult and frustrating learning curve. A dearth of in-app explanation during user configuration.